An asteroid hit the moon! Okay, okay, this isn’t big news. Stuff crashes into the moon all the freaking time. What with not having an atmosphere and all, it is regularly bombarded by space debris (how do you think it got its cratered face?) and is actually responsible for shielding Earth a little bit. Through physics I haven’t understood, when something intersects Earth’s orbit, it is more likely to hit the moon (I believe this is the case, I could be mistaken). Not to say stuff doesn’t come for Earth, but most of that just burns up thanks to our beloved friend, oxygen. Actually, the atmosphere is primarily made of nitrogen (78%) with oxygen coming in a distant second (21%). Then there are trace other gases. But I digress.
The asteroid that struck the moon was only 25cm wide, meaning I’ve found a couple rocks in my garden bigger than it, but it struck the moon going 38km/s! This is the equivalent to 17 BILLION joules of kinetic energy, also equivalent to 4 tons of TNT going off (see article). I wish I could lob some of the rocks I have at the moon that fast.
Anyway, this fascinating article came to me via NASA’s Science News mailing list. If you think it’s just for nerds, think again! Well, now that you’ve thought twice about it and come to the same conclusion that it is for nerds, embrace your nerd-ity and sign up for it. I’ve gotten articles about terraforming Mars, comets, planetary alignments, new extra-solar discoveries, and developments on the mission to go back to the moon and set up for a month long stay. This article partly deals with that since we’re still finding out just how much space-junk collides with the moon so the astronauts can avoid becoming swiss cheese.
So here is the article, it’s not terribly long so read it. Plus there’s a short clip showing the explosion (it’s not dramatic, but still cool):
http://science.nasa.gov/headlines/y2006/13jun_lunarsporadic.htm?list784223