A U.S. spacecraft orbiting Mars has provided evidence of an ancient crater lake fed by groundwater, adding further support to theories that the Red Planet may once have hosted life, NASA said Sunday.

A long-delayed restoration of the Colosseum's only intact internal passageway has yielded ancient traces of red, black, green and blue frescoes — as well as graffiti and drawings of phallic symbols — indicating that the arena where gladiators fought was far more colorful than previously thought.

Yoko Ono, Sean Lennon and Susan Sarandon spoke out against fracking Thursday during a tour of natural-gas drilling sites in northeastern Pennsylvania, warning about what they view as the danger to air, water and human health.

The Mars rover Curiosity will soon begin to drill into the Red Planet for the first time, mission officials said Tuesday ahead of the highly anticipated endeavor.

Israel's national museum said Tuesday it will open what it calls the world's first exhibition devoted to the architectural legacy of biblical King Herod, the Jewish proxy monarch who ruled Jerusalem and the Holy Land under Roman occupation two millennia ago.

Ancient Indians migrated to Australia and mixed with Aborigines 4,000 years ago, bringing the dingo's ancestor with them, according to new research that re-evaluates the continent's long isolation before European settlement.

Russia's struggling space agency has unveiled a new multibillion-dollar plan that will see the development of a replacement for the aging Soyuz rocket by 2020.

A hardy bacteria common on Earth was surprisingly adaptive to Mars-like low pressure, cold and carbon dioxide-rich atmosphere, a finding that has implications in the search for extraterrestrial life.

An asteroid believed to pose a remote risk of colliding with Earth this century is 20 percent bigger than previously thought, the European Space Agency (ESA) said on Wednesday.

The Milky Way contains at least 17 billion planets the size of Earth, and likely many more, according to a study out Monday that raises the chances of discovering a sister planet to ours.