Mars: Was there once life there?

Nasa says it's found new evidence which suggests Mars could have supported ancient life.

The Curiosity Rover - which is a robot that Nasa has sent to explore Mars - has discovered three different types of organic compounds.

The compounds were found after Curiosity dug just five centimetres down into 3-billion-year-old rock on an ancient lake bed.

It's also found a source of a gas called methane.