comet
The comet last visited during Neanderthal times, according to NASA.
A rare comet sighting, Bastille Day fireworks, and a sea lion cub round out this week's best images.
The bright green comet has arrived just in time for the holidays.
It's also been called "The Great Pumpkin" asteroid.
WHAT'S HAPPENING
The hunt is over!
The captivating shot was taken from a farmer's field in Georgia.