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.

A discovery that many small companion galaxies surrounding Andromeda seem to orbit in concert — and aligned in a vast, thin disk — could change scientists' understanding of how galaxies form, researchers said this week.

Scientists and broadcasters said Monday they have captured footage of an elusive giant squid, up to eight meters (26 feet) long that roams the depths of the Pacific Ocean.

Scientists have identified the first meteorite to originate from the surface of Mars, a 2.1-billion-year-old specimen that contains about 10 times more water than any other space rock from Mars.

Scientists are abuzz about a coal-colored rock from Mars that landed in the Sahara desert: A yearlong analysis revealed it's quite different from other Martian meteorites.

A cache of 1,000-year-old documents written by the Jewish community in Afghanistan and unveiled in Jerusalem on Thursday sheds unprecedented light on the mediaeval Jewish community in central Asia.

Astronomers using the most advanced land telescope in the world said on Wednesday they had unlocked knowledge about how formidable “gas giant” planets such Jupiter and Saturn come into being.