What's the difference between a comet, asteroid, meteor, meteoroid and…

With all the recent buzz over asteroid AD14, the meteor over Chelyabinsk, the fragments of meteorite recovered in Russia's Ural mountains, and yesterday's news that the fireball originated from our solar system's asteroid belt, one can't help but wonder: what's the difference between all these -oids, -ors and -ites?… » 2/27/13 12:40pm 2/27/13 12:40pm

Further Proof That Life May Have Originated In Space

We usually think of asteroid impacts as harbingers of mass extinction » 8/14/08 8:00am 8/14/08 8:00am, but they might be the reason life exists on our planet at all. It's possible for bacteria to hitch rides on rocks ejected by space impacts and move from planet to planet. We know that certain Earth bacteria are capable of surviving the hostile…