Media playback is unsupported on your device

Mars rover finds evidence that the red planet was once habitable

19 July 2013 Last updated at 06:53 BST

Nasa's Curiosity rover has found strong evidence that Mars was once habitable.

Results of the most detailed analysis of the Martian atmosphere suggests that more than four billion years ago it was quite similar to Earth.

Pallab Ghosh reports.

BBC © 2014 The BBC is not responsible for the content of external sites. Read more.

This page is best viewed in an up-to-date web browser with style sheets (CSS) enabled. While you will be able to view the content of this page in your current browser, you will not be able to get the full visual experience. Please consider upgrading your browser software or enabling style sheets (CSS) if you are able to do so.