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An artist’s concept of an astronaut walking on Mars. But what would happen if the astronaut weren’t wearing a space helmet? cokada/E+ via Getty Images

Could people breathe the air on Mars?

Mars is the fourth planet from the Sun and one of our closest neighbors in space. But it’s not a very welcoming place for an Earthling to visit.
Earth experiences constant volcanic activity - here’s Indonesia’s Mount Anak Krakatau (Child of Krakatoa) photographed in July 2018. EPA/AAP

I’ve Always Wondered: Why are the volcanoes on Earth active, but the ones on Mars are not?

Compared to Earth, more “oomph” is required to bring magma to the surface of Mars, and this is probably why we haven’t seen any recent eruptions on the red planet.

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