There is something about parenthood that gives us a sense of history and a deeply rooted desire to send on into the next generation the great things we have discovered about life. And part of that is the desire to instill in our children the love of science, of learning and particularly the love of nature.
Your fascination with the universe and how to explore it as we so often do in the field of astronomy can be highly academic and dry as maybe it was if you took a course in astronomy. But when you get out there in the field at night, your equipment is just right and the night sky comes alive with activity, there is no other experience like it for majesty and pure excitement. And that is the kind of experience we want our children to come to love as much as we do.
It’s actually not a big jump from play to learning for children when it comes to learning about the natural world, science and astronomy. Exploration is a natural part of being a child and growing up in a fascinating world and universe. So if we can find ways to take that natural desire to explore and instill a life long passion for astronomy, we will have given our children a truly great gift.
So with a few simple family activities, we can instill that love of astronomy in our offspring. Here are some ideas.
* Make star gazing part of family life. You already love to go outdoors as often as possible to enjoy the stars. So don’t let that be your private passion. Get everybody into the act. The kids will love it and look forward to those nights as much as going to the circus.
* Make each new experience in growing into astronomy a fresh threshold. So the first experiences might be what you experienced as a kid, just laying on your back out in the country with the panorama of the stars overhead trying to take it all in. Go ahead and challenge them to count the stars. It’s a fun exercise and one they will save to use as a joke on their kids when they do this same thing in a few decades.
* Take them along the road of learning, introducing binoculars so they can focus on particular areas of the night sky.
* Now they are hooked and want to know about why some of the stars are brighter than others. They have no idea they are going to astronomy school and don’t even know it. You can tell them about the constellations as you point out how to find them by keying off the North Star. By being able to find things in that mass of stars and knowing there is such a vast amount more they can pick out, they are ripe for learning from star maps and about how the galaxies work.
* Think of their excitement as they notice the changes in the night sky. The phases of the moon and the effect of the rotation of the earth on the position of the planets. Help them find their favorite celestial bodies each night. Before long they will learn to chart the movement of the stars just like the early astronomers did.
* Now you will get caught up in the excitement of finding new things to reveal to your excited crew of fledgling astronomers. When you reveal that you are going on a safari to see an eclipse, a meteor shower or the once in a lifetime appearance of a comet, that gift will as big as anything you might spring on them for Christmas.
The wonders of the night sky will captivate your children the way it has you for years. And you will have done them the greatest favor you ever could do by making them lifelong lovers of the universe.
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Friday, October 2, 2009
The History of Astronomy
If you have a passion for star gazing, telescopes, the Hubble and the universe and this thing we call “astronomy”, you are far from alone. Of course, we know that astronomy is a highly respected science that has produced some of the most amazing accomplishments of the twentieth century. On top of that, it is a thriving area of fascination and one of the most exciting hobby areas going with thousands of astronomy clubs and tens of thousands of amateur astronomers watching the stars every night just like we do.
But did you know that astronomy is one of the oldest and most respected sciences of them all? As far back as before the times of Christ, the wise and thinking people of societies of the time were looking at the stars and finding ways to track and chart them. We who love the hobby of astronomy can chart a proud history of astronomers that tracks across millennia and through virtually every culture in civilization. So for the sake of having some really good trivia to toss around at astronomy club next week, let’s highlight some of the big moments in the history of astronomy.
For many centuries the science of astronomy was not distinct from the practice of astrology. For clarity, astronomy is the study of the stars, planets, and the universe with a clearly scientific approach. Astrology is the study of the zodiac signs and how they influence our growth, our personalities and our daily lives. In modern times, we as people of science discount the astrological side and focus on the astronomy of the heavens. But they were one study for millennia before the age of science made them separate.
There is historical evidence that astronomy was a recognized science as far back as the Babylonian civilization hundreds of years before Christ. But the study of the stars was not limited to one country. There were similar movements going on in China, India, and Ancient Egypt and all over the Arabian Peninsula. The integration of astronomy and religion is so prevalent that we see it in the Christmas story in which the Magi, Zoroastrian priesthood probably from the equivalent of ancient Syria, followed a star to the Christ child. These astronomers were also astrologers and it was that mixture that lead them to be part of this historic event.
The first book on astronomy was written by Ptolemy during the Greek empire. Since that historic publication, the who’s who list of great astronomers charts a path right through the center of modern science including Copernicus, Galileo, Kepler, Sir Issac Newton, Jung, Michelangelo, Benjamin Franklin and more recently even Einstein and Stephen Hawkings would join that noble list. It seemed that from the renaissance on to this day, virtually any man or woman of intellect dabbled in astronomy at least somewhat and it has always been considered a sign of the learned to know about the universe and things astronomical.
Astronomy has had an impact on so many areas of our lives that we really don’t recognize. Many words in our language had their roots in astronomy such as…
* Influenza which comes from the Latin root word for influence. This reflects an early belief that the position of the moon and stars may influence health and cause or cure disease.
* Disaster which comes from the Latin for “bad star”.
* Lunatic which has the root word "Luna" in it which is the Latin word for moon. This highlights the long held belief that is even prevalent today that irrational behavior and even wild and dangerous things happen during a full moon.
Astronomy and its interrelationship with astrology has also influenced culture, education and religion to a very large extent over the centuries. In the English language, the first two days or our week, Sunday and Monday are a reference to astronomy as their literal interpretations would be “The Day of the Sun” and “The Day of the Moon.”
So if you have found astronomy becoming a consuming passion in your thoughts and what fascinates you about the world we live in, you are in great company as this area of study has been a major part of culture and thought virtually since the dawn of civilization. And it will continue to fascinate mankind for as long as those beautiful stars shine over our heads.
But did you know that astronomy is one of the oldest and most respected sciences of them all? As far back as before the times of Christ, the wise and thinking people of societies of the time were looking at the stars and finding ways to track and chart them. We who love the hobby of astronomy can chart a proud history of astronomers that tracks across millennia and through virtually every culture in civilization. So for the sake of having some really good trivia to toss around at astronomy club next week, let’s highlight some of the big moments in the history of astronomy.
For many centuries the science of astronomy was not distinct from the practice of astrology. For clarity, astronomy is the study of the stars, planets, and the universe with a clearly scientific approach. Astrology is the study of the zodiac signs and how they influence our growth, our personalities and our daily lives. In modern times, we as people of science discount the astrological side and focus on the astronomy of the heavens. But they were one study for millennia before the age of science made them separate.
There is historical evidence that astronomy was a recognized science as far back as the Babylonian civilization hundreds of years before Christ. But the study of the stars was not limited to one country. There were similar movements going on in China, India, and Ancient Egypt and all over the Arabian Peninsula. The integration of astronomy and religion is so prevalent that we see it in the Christmas story in which the Magi, Zoroastrian priesthood probably from the equivalent of ancient Syria, followed a star to the Christ child. These astronomers were also astrologers and it was that mixture that lead them to be part of this historic event.
The first book on astronomy was written by Ptolemy during the Greek empire. Since that historic publication, the who’s who list of great astronomers charts a path right through the center of modern science including Copernicus, Galileo, Kepler, Sir Issac Newton, Jung, Michelangelo, Benjamin Franklin and more recently even Einstein and Stephen Hawkings would join that noble list. It seemed that from the renaissance on to this day, virtually any man or woman of intellect dabbled in astronomy at least somewhat and it has always been considered a sign of the learned to know about the universe and things astronomical.
Astronomy has had an impact on so many areas of our lives that we really don’t recognize. Many words in our language had their roots in astronomy such as…
* Influenza which comes from the Latin root word for influence. This reflects an early belief that the position of the moon and stars may influence health and cause or cure disease.
* Disaster which comes from the Latin for “bad star”.
* Lunatic which has the root word "Luna" in it which is the Latin word for moon. This highlights the long held belief that is even prevalent today that irrational behavior and even wild and dangerous things happen during a full moon.
Astronomy and its interrelationship with astrology has also influenced culture, education and religion to a very large extent over the centuries. In the English language, the first two days or our week, Sunday and Monday are a reference to astronomy as their literal interpretations would be “The Day of the Sun” and “The Day of the Moon.”
So if you have found astronomy becoming a consuming passion in your thoughts and what fascinates you about the world we live in, you are in great company as this area of study has been a major part of culture and thought virtually since the dawn of civilization. And it will continue to fascinate mankind for as long as those beautiful stars shine over our heads.
The Amazing Hubble
In the history of modern astronomy, there is probably no one greater leap forward than the building and launch of the space telescope known as the Hubble. While NASA has had many ups and downs, the launch and continued operation of the Hubble space telescope probably ranks next to the moon landings and the development of the Space Shuttle as one of the greatest space exploration accomplishments of the last hundred years.
An amazing piece of astronomy trivia that few people know is that in truth, only about ten percent of the universe is visible using conventional methods of observation. For that reason, the Hubble really was a huge leap forward. That is for the very simple reason that the Hubble can operate outside of the atmosphere of Earth. Trying to make significant space exploration via telescopes from the terrestrial surface of planet Earth is very difficult. That very thing that keeps us alive, our own Earth’s atmosphere presents a serious distraction from being able to see deeper and further into space.
The Hubble space telescope was named after the great scientist and visionary Edward Hubble who discovered that the universe was expanding which was explained by what is now known in science as Hubble’s Law. To truly get a feel for the amazing accomplishment that was achieved with the launch of the Hubble telescope, spend some time on Nasa’s web site dedicated to the project at http://hubble.nasa.gov. There are also a number of sites where you can enjoy some stunning pictures from the Hubble including http://heritage.stsci.edu/ and http://www.stsci.edu/ftp/science/hdf/hdf.html.
It’s hard to believe how long the Hubble has been orbiting earth and sending back amazing video and pictures of what it is discovering in space. But the Hubble was actually initially launched on April 25th 1990. It was the culmination of literally decades of research and construction which began in 1977. Expectations were high as the orbiting telescope was put in place and actually began to function as it was designed to do.
All was not always perfect with the telescope and the early pictures were disappointing. After some study NASA discovered that the reason for the early failures was the curvatures of one of the main lenses of the orbiting telescope.
We probably could never have kept this intricate piece of equipment operational as well as we have had we not had the Space Shuttle program to give us a tool to implement repairs and improvements to the Hubble. In 1993 a new lens was installed on the Hubble which corrected the problem of picture resolution that was noted in the early operation of the telescope.
Two other repair and upgrade mission have been made to the Hubble since it launched, both of them in 1997 to upgrade older equipment and to retrofit the telescope to extend its useful life through 2010. It’s pretty amazing to think that this scientific and mechanical marvel has been operating now for ten years without maintenance. We can be assured that plans are in the works for NASA to upgrade or replace parts on the Hubble to extend its useful life even further as that 2010 time frame draws closer.
It is hard to imagine the science of astronomy or the natural quest for greater knowledge of our universe without the Hubble. While many times those who would not fund space exploration have tried to cut funding for the Hubble, the operation of this telescope is just too important to astronomers and to the scientific well being of mankind and our planet not to continue to use the Hubble, or its next natural successor. We will always need to have a set of eyes in the sky to watch the universe and discover more of its mysteries.
An amazing piece of astronomy trivia that few people know is that in truth, only about ten percent of the universe is visible using conventional methods of observation. For that reason, the Hubble really was a huge leap forward. That is for the very simple reason that the Hubble can operate outside of the atmosphere of Earth. Trying to make significant space exploration via telescopes from the terrestrial surface of planet Earth is very difficult. That very thing that keeps us alive, our own Earth’s atmosphere presents a serious distraction from being able to see deeper and further into space.
The Hubble space telescope was named after the great scientist and visionary Edward Hubble who discovered that the universe was expanding which was explained by what is now known in science as Hubble’s Law. To truly get a feel for the amazing accomplishment that was achieved with the launch of the Hubble telescope, spend some time on Nasa’s web site dedicated to the project at http://hubble.nasa.gov. There are also a number of sites where you can enjoy some stunning pictures from the Hubble including http://heritage.stsci.edu/ and http://www.stsci.edu/ftp/science/hdf/hdf.html.
It’s hard to believe how long the Hubble has been orbiting earth and sending back amazing video and pictures of what it is discovering in space. But the Hubble was actually initially launched on April 25th 1990. It was the culmination of literally decades of research and construction which began in 1977. Expectations were high as the orbiting telescope was put in place and actually began to function as it was designed to do.
All was not always perfect with the telescope and the early pictures were disappointing. After some study NASA discovered that the reason for the early failures was the curvatures of one of the main lenses of the orbiting telescope.
We probably could never have kept this intricate piece of equipment operational as well as we have had we not had the Space Shuttle program to give us a tool to implement repairs and improvements to the Hubble. In 1993 a new lens was installed on the Hubble which corrected the problem of picture resolution that was noted in the early operation of the telescope.
Two other repair and upgrade mission have been made to the Hubble since it launched, both of them in 1997 to upgrade older equipment and to retrofit the telescope to extend its useful life through 2010. It’s pretty amazing to think that this scientific and mechanical marvel has been operating now for ten years without maintenance. We can be assured that plans are in the works for NASA to upgrade or replace parts on the Hubble to extend its useful life even further as that 2010 time frame draws closer.
It is hard to imagine the science of astronomy or the natural quest for greater knowledge of our universe without the Hubble. While many times those who would not fund space exploration have tried to cut funding for the Hubble, the operation of this telescope is just too important to astronomers and to the scientific well being of mankind and our planet not to continue to use the Hubble, or its next natural successor. We will always need to have a set of eyes in the sky to watch the universe and discover more of its mysteries.
Shooting Stars
If you are a serious astronomy fanatic like a lot of us are, you can probably remember that one event in childhood that started you along this exciting hobby. It might have been that first time you looked through a telescope. But for many of us, it was that first time we saw a rain of fire from the sky that we eventually came to know as a meteoroid shower.
At the time when you see the first one, it’s easy to remember the movie “war of the worlds” or some other fantastic image of aliens entering our atmosphere in droves to take over the planet. But with some guidance and explanation of what was going on, we eventually learned that these showers were not at all threatening or any kind of invasion. For the most part meteoroid showers are harmless, part of nature and very fun to watch.
So what are these strange lights in the sky? Are they aliens invading from Mars? Are the comets coming to start the next ice age? Or perhaps asteroids burning up as they enter the earths atmosphere. The answer to the above questions is no to the first and “yes and no” to the other two.
A meteoroid is actually a small piece of space rubble, usually dust or small rocks that come from either a comet or the break up of an asteroid in space and that eventually plummets toward the earth. We say “toward the earth” because the lights you see are the friction of the atmosphere burning up those small space tidbits and creating a spectacular show for all of us as they do so. A particularly exciting moment to witness is when a meteoroid breaks up or explodes on entry. A meteoroid that explodes is called bolides.
There are some interesting details about the life of a meteoroid that make the viewing of shooting stars even more fun. To be seen, a meteoroid only needs to weigh as little as a millionth of a gram. But the thing that makes them so spectacular to see is the tremendous speeds they reach as they enter the atmosphere. Before burning up, a meteoroid will reach between 11 and 74 kilometers per second which is 100 times faster than a speeding bullet.
We tend to think of t seeing a shooting star as a freak event and we associate it with superstition (hence, wish on a lucky star). But there are actually thousands of them every year so it really isn’t that rare to see one. In fact, scientists tell us that over 200,000 tons of space matter enters the atmosphere each year and burns up on entry.
Comets are a big source of meteoroids because of the nature of those long tails. A large amount of dust, ice and other space debris gets caught up in a comet’s tail as it moves toward the sun. Then as the comet moves away from the sun in its orbit, tons of this matter is thrown off into space to disperse. As the Earth moves in its routine orbit around the sun, it often crosses through clouds of this discarded matter which becomes one of those “meteor showers” that are so popular for viewing.
These showers of shooting stars are pretty easy for astronomers to predict so you can get into position to see the excitement at just the right time of night and be looking at the right area of the night sky. Usually the astronomy magazine or site will give you a general time and location to be ready to look when the meteoroids start to fall.
Now keep in mind, this is a phenomenon of nature, so it may not observe the time table exactly. Also note that there is a notation system for where the meteoroid shower will occur based on what constellation is its backdrop. The section of the sky to focus on for the show is called the “radiant” because that is where the entering meteoroids begin to glow or radiate. The radiant is named for the constellation it is nearest too. So if the meteor shower is going to occur in the constellation of Leo, then its radiant will be called Leonid. This will help you decipher the listing of asteroid showers in the publications.
At the time when you see the first one, it’s easy to remember the movie “war of the worlds” or some other fantastic image of aliens entering our atmosphere in droves to take over the planet. But with some guidance and explanation of what was going on, we eventually learned that these showers were not at all threatening or any kind of invasion. For the most part meteoroid showers are harmless, part of nature and very fun to watch.
So what are these strange lights in the sky? Are they aliens invading from Mars? Are the comets coming to start the next ice age? Or perhaps asteroids burning up as they enter the earths atmosphere. The answer to the above questions is no to the first and “yes and no” to the other two.
A meteoroid is actually a small piece of space rubble, usually dust or small rocks that come from either a comet or the break up of an asteroid in space and that eventually plummets toward the earth. We say “toward the earth” because the lights you see are the friction of the atmosphere burning up those small space tidbits and creating a spectacular show for all of us as they do so. A particularly exciting moment to witness is when a meteoroid breaks up or explodes on entry. A meteoroid that explodes is called bolides.
There are some interesting details about the life of a meteoroid that make the viewing of shooting stars even more fun. To be seen, a meteoroid only needs to weigh as little as a millionth of a gram. But the thing that makes them so spectacular to see is the tremendous speeds they reach as they enter the atmosphere. Before burning up, a meteoroid will reach between 11 and 74 kilometers per second which is 100 times faster than a speeding bullet.
We tend to think of t seeing a shooting star as a freak event and we associate it with superstition (hence, wish on a lucky star). But there are actually thousands of them every year so it really isn’t that rare to see one. In fact, scientists tell us that over 200,000 tons of space matter enters the atmosphere each year and burns up on entry.
Comets are a big source of meteoroids because of the nature of those long tails. A large amount of dust, ice and other space debris gets caught up in a comet’s tail as it moves toward the sun. Then as the comet moves away from the sun in its orbit, tons of this matter is thrown off into space to disperse. As the Earth moves in its routine orbit around the sun, it often crosses through clouds of this discarded matter which becomes one of those “meteor showers” that are so popular for viewing.
These showers of shooting stars are pretty easy for astronomers to predict so you can get into position to see the excitement at just the right time of night and be looking at the right area of the night sky. Usually the astronomy magazine or site will give you a general time and location to be ready to look when the meteoroids start to fall.
Now keep in mind, this is a phenomenon of nature, so it may not observe the time table exactly. Also note that there is a notation system for where the meteoroid shower will occur based on what constellation is its backdrop. The section of the sky to focus on for the show is called the “radiant” because that is where the entering meteoroids begin to glow or radiate. The radiant is named for the constellation it is nearest too. So if the meteor shower is going to occur in the constellation of Leo, then its radiant will be called Leonid. This will help you decipher the listing of asteroid showers in the publications.
Our Neighbors in Space
We have a special feeling toward the other planets that circle our sun. Maybe it’s all the science fiction stories about visiting the moon, Mars and other planets. But we love to think about those planets that make up what we call “the solar system.” that do what our planet does but do it very differently indeed.
The planets of our solar system have taken on personalities and mythical appeal in our literature and arts. It is easy to find artists who render their vision of the planets that make up our society of planets near our sun. The names of the planets, Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, and Neptune are all from our cultural past being gods from Greek and Roman mythology. But the solar system is not just made up of these planets. The solar system is a very busy place indeed.
In 2006, there was quite a bit of controversy as scholars and astronomers agreed to downgrade Pluto and remove its status as a planet. So you have to wonder, what is it that makes something a planet and what happened to Pluto? It didn’t just go away so it must still be out there. A planet, by scientific definition is any object in orbit around a sun, that has formed into some kind of round object is a planet as long as it has cleared away any other orbiting items around it. By cleared away, that doesn’t mean it has destroyed all space debris etc. For example, our planet has not “cleared away” the moon but it has captured it into its own orbit so we classify as a planet. That’s a relief huh?
There are many objects floating around in our solar system other than the planets we know of. It’s an interesting piece of trivia that in addition to the planets there are 165 moons orbiting around those nine planets. Some of those moons are so advanced that some scientists have suspected that they might have supported life at some point.
In addition to the regular planets and moons, there are dwarf planets, asteroid belts and routine visits by comets that create a lot of traffic in our cosmic corner of the universe. The two known dwarf planets that exist on the outer rim of our solar system are Eries and Ceres. So when Pluto’s status was changed to be removed from the list of planets, it simply joined those two bodies as dwarf planets but still a solid citizen of the community of celestial bodies around our sun.
In addition to these larger bodies, there is an asteroid belt that exists between Mars and Jupiter that most of the asteroids that we see in our night sky come from. There is another belt of large objects further out called the Kuiper belt as well as a “bubble” in space called a heliopause and there is a suspected additional belt outside the known solar system called the Oort belt that we think is the origin of a lot of large asteroids and comets that frequent our solar system and come to orbit our sun.
As fascinating as these many celestial bodies who are our neighbors in space is the origin of our solar system. We have to break it down to simple terms to understand the terms but we know that the early history of the solar system and the universe was one of great bodies of gas and clouds of matter eventually cooling and heating, exploding and spinning off stars and other massive space giants that became more stars, galaxies and solar systems. It was from this erratic activity that our sun separated from the gasses and carried with it the material that became our solar system. The gravity of the sun captured sufficient matter that it began to go through the process of forming, cooling, exploding and separating. This is what happened as the planets all went through he same process eventually establishing stable orbits and small objects falling into orbit around them.
When you think of how powerful and out of control this process is, it’s amazing to step back and see the beauty of the organization of our solar system today. The more detail you learn about the history of our solar system, the more you will enjoy your explorations of the planets with your telescope. That that discovery is part of the fun of astronomy.
The planets of our solar system have taken on personalities and mythical appeal in our literature and arts. It is easy to find artists who render their vision of the planets that make up our society of planets near our sun. The names of the planets, Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, and Neptune are all from our cultural past being gods from Greek and Roman mythology. But the solar system is not just made up of these planets. The solar system is a very busy place indeed.
In 2006, there was quite a bit of controversy as scholars and astronomers agreed to downgrade Pluto and remove its status as a planet. So you have to wonder, what is it that makes something a planet and what happened to Pluto? It didn’t just go away so it must still be out there. A planet, by scientific definition is any object in orbit around a sun, that has formed into some kind of round object is a planet as long as it has cleared away any other orbiting items around it. By cleared away, that doesn’t mean it has destroyed all space debris etc. For example, our planet has not “cleared away” the moon but it has captured it into its own orbit so we classify as a planet. That’s a relief huh?
There are many objects floating around in our solar system other than the planets we know of. It’s an interesting piece of trivia that in addition to the planets there are 165 moons orbiting around those nine planets. Some of those moons are so advanced that some scientists have suspected that they might have supported life at some point.
In addition to the regular planets and moons, there are dwarf planets, asteroid belts and routine visits by comets that create a lot of traffic in our cosmic corner of the universe. The two known dwarf planets that exist on the outer rim of our solar system are Eries and Ceres. So when Pluto’s status was changed to be removed from the list of planets, it simply joined those two bodies as dwarf planets but still a solid citizen of the community of celestial bodies around our sun.
In addition to these larger bodies, there is an asteroid belt that exists between Mars and Jupiter that most of the asteroids that we see in our night sky come from. There is another belt of large objects further out called the Kuiper belt as well as a “bubble” in space called a heliopause and there is a suspected additional belt outside the known solar system called the Oort belt that we think is the origin of a lot of large asteroids and comets that frequent our solar system and come to orbit our sun.
As fascinating as these many celestial bodies who are our neighbors in space is the origin of our solar system. We have to break it down to simple terms to understand the terms but we know that the early history of the solar system and the universe was one of great bodies of gas and clouds of matter eventually cooling and heating, exploding and spinning off stars and other massive space giants that became more stars, galaxies and solar systems. It was from this erratic activity that our sun separated from the gasses and carried with it the material that became our solar system. The gravity of the sun captured sufficient matter that it began to go through the process of forming, cooling, exploding and separating. This is what happened as the planets all went through he same process eventually establishing stable orbits and small objects falling into orbit around them.
When you think of how powerful and out of control this process is, it’s amazing to step back and see the beauty of the organization of our solar system today. The more detail you learn about the history of our solar system, the more you will enjoy your explorations of the planets with your telescope. That that discovery is part of the fun of astronomy.
Look – Up in the Sky!
When television was young, there was a hugely popular show based on the still popular fictional character of Superman. The opening of that show had a familiar phrase that went, “Look. Up in the sky. It’s a bird. It’s a plane. It’s Superman!” How beloved Superman has become in our culture and the worldwide fascination with extraterrestrials and all things cosmic only emphasizes that there is a deep curiosity in all humans about nature and astronomy, even if many people would not know to call it astronomy.
Astronomy is one of the oldest sciences of all time. When archeologists unearth ancient civilizations, even as far back as the cavemen, they invariably find art that shows mans unquenchable fascination with the stars. To this day, you can easily get an animated discussion at any gathering on the topic of “Is there intelligent life on other planets?”
Many have tried to explain mankind’s seeming obsession with outer space as a result of an ancient memory or as part of mankind’s eternal nature. Whatever the cause, people of every age and every nation share this one deep interest, to know more about the universe that our tiny planet is just a part of.
It’s rather strange because the actual conduct of a serious student of astronomy is really not the stuff of high adventure. You will never see a “Raiders of the Lost Arc” or “Jurassic Park” movie made about an astronomer. Excitement for lovers of this science is to stay up all night watching the cosmos through a powerful telescope. But that fact does not seem to discourage the tens of thousands to get into astronomy each year and the huge interest worldwide with the stars, the planets and the universe.
There may be no other universal human fascination that does so much to make national boundaries and even international animosity seem to evaporate. Other than the Olympic movement, international cooperation to achieve great strides for human kind in space seems to go forward without interruption even when the nations cooperating in those projects are virtually at war back on the surface of the earth. It is a strange thing to watch as Russian, American and other astronauts work together like brothers on space missions even as their home nations are busily pointing missiles at each other back at home. It almost makes you think that we should put more energy and money into the space program, not less because it seems to be a bond that heals tension rather than creates it.
Why is astronomy so exciting even though we have no dinosaurs, moving animals or any real danger to most who are obsessed with the discipline? It may go back to a basic curiosity that all human beings have about their natural habitat and this big mysterious thing out there called space. Maybe it goes back to that old saying at the beginning of Star Trek that space is “the final frontier”.
But we all share that ongoing sense of excitement each time we take out our telescopes and gaze directly at the cosmos above us. We feel we are looking at the very dawn of time. And in light of the issues with the speed of light which means that many of the twinkling stars out there are really light from those stars that started their journey to us thousands of years ago, we are in actually looking directly at the past every time we direct our eyes skyward.
But we don’t have to worry about ever conquering the final frontier and finding our curiosity satisfied. There will always be more to learn and discover in the world of astronomy. And it is likely that mankind’s curiosity about astronomy is just as limitless as well.
Astronomy is one of the oldest sciences of all time. When archeologists unearth ancient civilizations, even as far back as the cavemen, they invariably find art that shows mans unquenchable fascination with the stars. To this day, you can easily get an animated discussion at any gathering on the topic of “Is there intelligent life on other planets?”
Many have tried to explain mankind’s seeming obsession with outer space as a result of an ancient memory or as part of mankind’s eternal nature. Whatever the cause, people of every age and every nation share this one deep interest, to know more about the universe that our tiny planet is just a part of.
It’s rather strange because the actual conduct of a serious student of astronomy is really not the stuff of high adventure. You will never see a “Raiders of the Lost Arc” or “Jurassic Park” movie made about an astronomer. Excitement for lovers of this science is to stay up all night watching the cosmos through a powerful telescope. But that fact does not seem to discourage the tens of thousands to get into astronomy each year and the huge interest worldwide with the stars, the planets and the universe.
There may be no other universal human fascination that does so much to make national boundaries and even international animosity seem to evaporate. Other than the Olympic movement, international cooperation to achieve great strides for human kind in space seems to go forward without interruption even when the nations cooperating in those projects are virtually at war back on the surface of the earth. It is a strange thing to watch as Russian, American and other astronauts work together like brothers on space missions even as their home nations are busily pointing missiles at each other back at home. It almost makes you think that we should put more energy and money into the space program, not less because it seems to be a bond that heals tension rather than creates it.
Why is astronomy so exciting even though we have no dinosaurs, moving animals or any real danger to most who are obsessed with the discipline? It may go back to a basic curiosity that all human beings have about their natural habitat and this big mysterious thing out there called space. Maybe it goes back to that old saying at the beginning of Star Trek that space is “the final frontier”.
But we all share that ongoing sense of excitement each time we take out our telescopes and gaze directly at the cosmos above us. We feel we are looking at the very dawn of time. And in light of the issues with the speed of light which means that many of the twinkling stars out there are really light from those stars that started their journey to us thousands of years ago, we are in actually looking directly at the past every time we direct our eyes skyward.
But we don’t have to worry about ever conquering the final frontier and finding our curiosity satisfied. There will always be more to learn and discover in the world of astronomy. And it is likely that mankind’s curiosity about astronomy is just as limitless as well.
Comets - Visitors From Beyond.
The one thing we love the most in the world of astronomy is a good mystery. And if there was ever a mysterious and yet very powerful force of nature that we witness in the night skies, it is the coming of the mighty comet.
The arrival of a comet within view of Earth is an event of international importance. Witness the huge media attention that the Haley or Hale-Bopp have had when they have come within view The sight of these amazing space objects is simultaneously frightening and awe inspiring.
Above all, it is during these comet viewings that the astronomer comes out in all of us. But what is a comet? Where did it come from? And how does it get that magnificent tail?
We should never confuse comets with asteroids. Asteroids are small space rocks that come from an asteroid belt between Mars and Jupiter. While still quite stunning to see, they pale in comparison to the arrival of a comet. Asteroids also have received considerable study by the scientific community.
Not as much is known about comets. As a rule, comets are considerably larger than asteroids. The composition of a comet is a mixture of nebulous, gasses, ice, dust and space debris. One scientist called the composition of a comet as similar to a “dirty snowball” because the composition is so diverse and changeable. The center or nucleus of a comet is usually quiet solid but the “snowball” materials often create a “cloud” around that nucleus that can become quite large and that extends at great lengths behind the comet as it moves through space. That trailing plume is what makes up the comet’s magnificent tail that makes it so exciting to watch when a comet comes within view of Earth.
The origins of comets is similarly mysterious. There are a number of theories about where they come from but it is clear that they originate from outside our solar system, somewhere in deep space. Some have speculated they are fragments left over from the organization of planets that get loose from whatever gravitational pull and are sent flying across space to eventually get caught up in the gravity of our sun bringing them into our solar system.
Another theory is that they come from a gaseous cloud called the Oort cloud which is cooling out there after the organization of the sun. As this space debris cools, it gets organized into one body which then gathers sufficient mass to be attracted into the gravity of our solar system turning into a fast moving comet plummeting toward our sun. However, because of the strong gravitational orbits of the many planets in our solar system, the comet does not always immediately collide with the sun and often takes on an orbit of its own.
The life expectancy of comets varies widely. Scientists refer to a comet that is expected to burn out or impact the sun within two hundred years as a short period comet whereas a long period comet has a life expectancy of over two hundred years. That may seem long to us as earth dwellers but in terms of stars and planets, this is a very short life as a space object indeed.
Scientists across the globe have put together some pretty impressive probes to learn more about comets to aid our understanding of these visitors from beyond. In 1985, for example, the United States put a probe into the path of the comet Giacobini-Zinner which passed through the comets tail gathering tremendous scientific knowledge about comets. Then in 1986, an international collation of scientists were able to launch a probe that was able to fly close to Haley’s comet as it passed near Earth and continue the research.
While science fiction writers and tabloid newspapers like to alarm us with the possibility of a comet impacting the earth, scientists who understand the orbits of comets and what changes their paths tell us this is unlikely. That is good because some comets reach sizes that are as big as a planet so that impact would be devastating. For now, we can enjoy the fun of seeing comets make their rare visits to our night sky and marvel at the spectacular shows that these visitors from beyond put on when they are visible in the cosmos.
The arrival of a comet within view of Earth is an event of international importance. Witness the huge media attention that the Haley or Hale-Bopp have had when they have come within view The sight of these amazing space objects is simultaneously frightening and awe inspiring.
Above all, it is during these comet viewings that the astronomer comes out in all of us. But what is a comet? Where did it come from? And how does it get that magnificent tail?
We should never confuse comets with asteroids. Asteroids are small space rocks that come from an asteroid belt between Mars and Jupiter. While still quite stunning to see, they pale in comparison to the arrival of a comet. Asteroids also have received considerable study by the scientific community.
Not as much is known about comets. As a rule, comets are considerably larger than asteroids. The composition of a comet is a mixture of nebulous, gasses, ice, dust and space debris. One scientist called the composition of a comet as similar to a “dirty snowball” because the composition is so diverse and changeable. The center or nucleus of a comet is usually quiet solid but the “snowball” materials often create a “cloud” around that nucleus that can become quite large and that extends at great lengths behind the comet as it moves through space. That trailing plume is what makes up the comet’s magnificent tail that makes it so exciting to watch when a comet comes within view of Earth.
The origins of comets is similarly mysterious. There are a number of theories about where they come from but it is clear that they originate from outside our solar system, somewhere in deep space. Some have speculated they are fragments left over from the organization of planets that get loose from whatever gravitational pull and are sent flying across space to eventually get caught up in the gravity of our sun bringing them into our solar system.
Another theory is that they come from a gaseous cloud called the Oort cloud which is cooling out there after the organization of the sun. As this space debris cools, it gets organized into one body which then gathers sufficient mass to be attracted into the gravity of our solar system turning into a fast moving comet plummeting toward our sun. However, because of the strong gravitational orbits of the many planets in our solar system, the comet does not always immediately collide with the sun and often takes on an orbit of its own.
The life expectancy of comets varies widely. Scientists refer to a comet that is expected to burn out or impact the sun within two hundred years as a short period comet whereas a long period comet has a life expectancy of over two hundred years. That may seem long to us as earth dwellers but in terms of stars and planets, this is a very short life as a space object indeed.
Scientists across the globe have put together some pretty impressive probes to learn more about comets to aid our understanding of these visitors from beyond. In 1985, for example, the United States put a probe into the path of the comet Giacobini-Zinner which passed through the comets tail gathering tremendous scientific knowledge about comets. Then in 1986, an international collation of scientists were able to launch a probe that was able to fly close to Haley’s comet as it passed near Earth and continue the research.
While science fiction writers and tabloid newspapers like to alarm us with the possibility of a comet impacting the earth, scientists who understand the orbits of comets and what changes their paths tell us this is unlikely. That is good because some comets reach sizes that are as big as a planet so that impact would be devastating. For now, we can enjoy the fun of seeing comets make their rare visits to our night sky and marvel at the spectacular shows that these visitors from beyond put on when they are visible in the cosmos.
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