Mars may now be a dead, desolate rock but it was once very much alive and almost Earth-like.
Rivers flowed over its surface and waterfalls cascaded down its peaks, while volcanoes blew lava into the sky.
And a BBC2 series presented by Professor Brian Cox uses CGI to show the Red Planet as it may have been.
The scientist explores how Mars, Venus and Mercury all had similar qualities to Earth as he tells the stories of “worlds born and worlds lost”.
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