Europa's deep ocean may seep to the surface

Astronomers have found the strongest evidence yet that the ocean on Jupiter's moon Europa may consist of salty water, like our own. And, they say, that salty water appears to be making its way to the surface.

Clues for bacteria on Mars could be found in Río Tinto

Researchers at the Centre of Astrobiology have positively identified microorganisms living inside salt deposits in the acidic and ferrous environment of the Tinto River in Huelva, Spain.

Team urges test of cloud brightening

Scientists are proposing a test of cloud brightening as a possible way of countering global warming.