Extraterrestrial

Not all planets orbit stars - some drift freely through the cosmos on their own. These cold, dark worlds don’t make great candidates for hosting life, but a new study suggests that their moons could be more habitable than they might seem.

One of the main goals of NASA’s Perseverance rover is to scour the surface of Mars for signs of ancient microbial life. But a new study of the geochemistry of the Red Planet suggests that life could still be thriving below its surface today.

A new study has found that in about a billion years’ time, Earth will rapidly lose most of its atmospheric oxygen, returning to how it was billions of years ago. This may have important implications in the search for life on other planets.

Jupiter’s moon Europa is a fascinating world, with a global subsurface ocean encased in an icy shell and plumes of water that vent into space. A new study has simulated how these plumes might originate, revealing a surprisingly dynamic ice ball.

A new study has identified 1,004 stars from which aliens could detect signs of life in Earth’s atmosphere by watching as our planet passes across the disk of the Sun. The study could help provide targets for groups searching for alien civilizations.

If a Mars rover ever were to find signs of life on the Red Planet, chances are that it would be in the form of compounds detected in the soil. A newly designed device could better help it do so, as compared to existing technologies.

While Mars may be the most likely place we might find life beyond Earth, it's not alone. High in the atmosphere of Venus, astronomers have made the startling discovery of a gas called phosphine – a strong contender for a sign of microbial life.

A new experiment placing bacteria on the outside of the International Space Station (ISS) has found that micro-organisms can survive in space for years, or even decades. The study lends weight to the idea that life could travel between planets.

Phosphorus is a key ingredient for life as we know it, but it’s strangely uncommon in the cosmos. Now astronomers have discovered a new type of star that’s very rich in phosphorus, which could imply that alien life is more common than we thought.

Given how big the universe is, chances are tiny that Earth is the only planet with life. But how would we find others? A new NASA grant has been awarded to try and do so by hunting for signs of advanced alien civilizations, or "technosignatures."

Enceladus’ unique "tiger stripe" fissures have long been something of a mystery. Why do these distinctive formations only exist at Enceladus’ south pole? Why they are so evenly spaced, and why they haven’t simply closed up or frozen over?

Just how common are potentially habitable Earth-like planets? Researchers on a new study claim to have come up with the most accurate estimate yet – and they’re more common than you might think.