Stephen Hawking has some new thoughts on black holes, but he's not saying they don't exist.

For a few weeks, weather uncovered the footprints of five prehistoric humans. And then washed them away again.

There's a leech that can survive being submerged in liquid nitrogen for 24 hours.

Astronomers have discovered what could be one of the oldest stars, formed from the exploded remains of one of the first stars.

The crippled Kepler Space Telescope has been resurrected, with an ingenious solution that restores part of its function.