Scientists are starting to use genetic information from bacteria to measure the health of vast areas of the ocean.
If China succeeds, it will be the first country ever to visit and land on Mars on its first try.
Water at informal settlements, where sanitation and waste management facilities were absent, had high bacteria levels.
Scientists don't claim to have evidence of life on Venus but they have ruled out pretty much everything else.
This summer, NASA's Mars Perseverance rover is taking the next giant leap in our search for signs of life beyond Earth.
Collecting samples from Mars and brining them back to Earth will be a hugely complicated task, but it may be our best bet of finding alien life.
NASA's Europa Clipper mission just got the green light - here's what it could achieve.
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.