Tanya Lewis

The Mars One colonization mission plans to bring live video of the surface of Mars to Earth via a privately built communications satellite and lander to launch as part of an unmanned mission in 2018.

For thousands of years, humans have been wondering whether there's life elsewhere in the universe. Now, the technology finally exists to search for it.

Humanity has reached a bottleneck this century: Technical developments could cause catastrophic damage to the planet, or they could save us from our man-made quandary.

Tens of thousands of people are prepared to leave their families, jobs and lives behind for a one-way trip to Mars. But what sort of person would go?

A coterie of aspiring Martians will descend on Washington, D.C. on Saturday (Aug. 3) for the first Million Martian Meeting.

Dione may once have had a subsurface ocean, scientists say.

The hardy microbes can withstand temperatures close to those on Mars.

Some supergiants release intense amounts of radiation when they die, and scientists may have figured out the cause.

The telltale Chicxulub crater might have been carved by a smaller object than thought.

Childhood recollections of the world's largest optical telescopes.

Most attempts to define it come up short, scientists say.

A mysterious peak in number of very bright meteors in the night sky happens each spring.