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Mars: A world both familiar and alien

31 May 2019, 13:00 UTC
Mars: A world both familiar and alien ESA/Roscosmos/CaSSIS, CC BY-SA 3.0 IGO

Mars is considered to be a terrestrial planet, which is to say similar to Earth (as opposed to the giant planets, which are about as different as planets can get from our home).

Despite that, Mars is wildly different from Earth as well. It’s a little over half the diameter of Earth, with 1/3rd the gravity, and far enough from the Sun to make it pretty cold — it can actually reach human-supporting temperatures on the equator in summer at noon, but even then at night it plummets enough to kill a human pretty quickly.

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