Whether anything could live in Europa's subsurface ocean depends on what kind of salt it contains. Now scientists have found out.
For the first time, an instrument orbiting Mars and a rover on the surface have detected methane simultaneously – raising hopes for finding life on the red planet.
Using the family relationships between single-celled protists alive today, researchers hypothesized what their evolutionary ancestors looked like – and then looked in the fossil record for matches.
There's enough dissolved oxygen in the salty lake below Mars' surface to support simple lifeforms such as sponges. Here's what that means for space exploration.
Studies from our own planet shed light on whether there could be life in a subglacial lake on Mars.
Nearly 50 years since the first man walked on the moon, our morals are still stranded on Earth.