The presence of apparent biological signatures on Venus has left UK-based researchers chasing down bacterial life in the planet's clouds.

The never-before-seen organelle serves as a recycling center for cellular cargo, evidence suggests.

The medical charity behind the controversial new plan says the benefits outweigh the risks.

One of Mars' tallest volcanoes peeps over a thick layer of clouds, in Odyssey’s first picture of Arsia Mons peering over the Red Planet's horizon.