> Space Station Mir splashed down Friday. It was the largest celestial event in Earth's history. It landed on target, and no damage is reported at the time of this post. Further information can be found at the links below.
>
> -Xi
>
> http://www.mirreentry.com/
>
> http://www.spacecom.af.mil/usspace/

It's the largest *manmade object* to fall to earth, not the largest celestial event. The largest celestial event (not counting the one that actually formed the earth) would probably be the meteor that blasted off a chunk of the planet that later became the moon.