Terrestrial organisms stuck on the outside of the International Space Station (ISS) have survived 533 days in the vacuum, intense ultraviolet radiation, and extreme temperature variations of space.

You know what that means? It’s not impossible for life to survive on Mars.

Of all the planets in the Solar System, Mars seems like the most likely candidate to host life. But it’s extremely inhospitable — dusty, arid, lower in gravity and oxygen, subject to harsh radiation due to its thinner atmosphere, cold and wracked by dust storms that can plunge the planet into darkness.

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