From Here To Kolob
Dark Matter: Crash Course Astronomy #41
So if you have not yet associated with a local astronomy club, now is the time to do it. Start rubbing elbows with people who live and breathe telescopes. Their input is a hundred times more reliable than what a sales brochure or that salesman might have to say because the telescope geeks have been where you are, made the mistakes and are eager to help you avoid those same mistakes.
These little fun facts should get a pretty spirited discussion going about the origins of the universe and about the possibility of space travel or if there are life on other planets. You can challenge the kids to calculate that if every star in the Milky Way supported nine planets and if only one of them was habitable like earth is, what are the odds that life would exist on one of them?
It really is amazing when you think about it that just by looking up on any given night, you could see virtually hundreds of thousands of stars, star systems, planets, moons, asteroids, comets and maybe a even an occasional space shuttle might wander by. It is even more breathtaking when you realize that the sky you are looking up at is for all intents and purposes the exact same sky that our ancestors hundreds and thousands of years ago enjoyed when they just looked up.
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.
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.
This theory has some credibility and, if it is true, it evokes some pretty startling images and foreboding fears in the current reining species on earth, the human race. The fact that asteroids are fast moving space debris only makes their movement and activity more interesting and exciting. Unlike a moon, planet or star, the odds that an asteroid could hit the earth are entirely reasonable and in fact, there are many documented cases of small asteroids making it through our atmosphere and leaving some pretty impressive craters in the earth s surface.