big picture science

big picture science

Water on Mars | Are We Alone?

2w ago
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Mars and Earth share surprising similarities, which leads many scientists to think Mars has water. | For more Are We Alone?, visit http://science.discovery.com/tv-shows/are-we-alone/#mkcpgn=ytsci1 Subscribe to Science Channel! | http://www.youtube.com/subscription_center?add_user=sciencechannel