Mars’s missing oceans

Why did Mars change from blue to red? This video by a National Geographic explorer explains what happened.

Mars’s missing oceans

Earth and Mars started off as very similar planets, which is why scientists are so interested in studying Mars. But there was one key difference which had huge ramifications – size. Mars is approximately half the size of Earth. As this video by National Geographic Explorer Brendan Mullan explains, this even accounts for the disappearance of Mars’s oceans:

Image credit:┬áNASA’s Goddard Space Flight Center

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