Nasa's Jet Propulsion Laboratory say electrical energy naturally produced at the sea floor gave rise to life.
Nasa to test first space-to-Earth communication system from International Space Station
Astronomers at Nasa, University of Washington and Utah's Weber State University say tilted worlds could contain life
Best photos of the day: 16 April 2014.
Chinese President Xi Jinping urges military to develop offensive and defensive space weapons.
Photos of the 'Blood Moon' captured by Twitter users across the globe.
Total lunar eclipse 'blood moon' was the first of a rare tetrad series of four total lunar eclipses.
Cassini spacecraft documents formation of new small icy object within the rings of Saturn.
Spaceflight company to launch Dragon cargo spaceship to the International Space Station
Mars' atmosphere never thick enough to keep water in a liquid state, say scientists
The first total lunar eclipse of 2014 will occur overnight on 14-15 April.
Slooh telescope will provide live coverage of Mars' closest call on Earth in six years
Tim Peake will spend six months on the International Space Station to investigate why space travel harms vision.
Mystery over rapid growth of sapling from cherry stone that went to space.
A total eclipse of the moon will be visible all over North America on 14-15 April.