On Earth, living things are absolutely everywhere - from desert salt pools to deep ice lakes in Antarctica. I can easily imagine life on Mars. But is there any evidence for it?
NASA has just announced results from 20 months of gas testing by its Curiosity rover. The rover sensed occasional bursts of methane gas. It doesn't prove anything - but there's a chance the methane could be created by bacterial life. Let's hurry up and get more advanced technology to Mars to find out if we have off-planet neighbours!