1 of 12Image
Originally named Deep Impact, NASA's Epoxi spacecraft made a close encounter with comet Hartley 2 - but this time it didn't send a bomb to explode on its surface. The spacecraft made its closest approach to the comet, about 435 miles, today after having traveled 23 million miles to find it.
Hartley 2 is about 1.2 miles long and is .25 miles wide at its most narrow portion. Jets of gases are streaming from the nucleus.