Sotheby's is putting some rare items up for auction, including what it calls the largest piece of Mars ever found on Earth.

The mystery of this slimy, greenish jelly has been lurking on planet Earth since past 3.5 billion years. It's yucky, but ...

The sight of the Milky Way stretching across the night sky is iconic, but some places offer a better view of it than others. These locations are among the best.