It's a little bit terrifying to think that there are giant rocks, flying straight at our planet, on a regular basis, but it's true.

Good thing we've got our atmosphere to help fry the occasional wayward piece of asteroid or comet as it heads our way...but once in a while, and handful (or more) make it through and we get everything from pretty shooting stars to terrifying meteor fireballs, not to mention the occasional nice-looking extraterrestrial rock.