From mudstones on Mars to strange gases in exoplanet atmospheres, tentative evidence for extraterrestrial life is starting to ...

The faraway moon has 'a slushy high-pressure ice layer' similar to the melting Arctic that could hide extraterrestrial life.

Saturn's moon, Enceladus, could harbour alien life deep within its underground oceans, according to the European Space Agency (ESA). Although the moon may appear barren, near the South Pole, tiny ...

Enceladus has a surface temperature of below - 200 degrees but is thought of having a large hot sub-surface ocean that shoots up plumes of material hundreds of miles up This three-image mosaic handout ...

Scientists have long looked to the skies for signs of alien life, imagining flying saucers or flashing lights. But a new theory suggests that alien probes could already be here, hiding in plain sight.