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Earth twins

Simulation of astronauts on Mars, according to SpaceX's vision to colonize the planet. Source: SpaceX.

Twenty big questions about the future of humanity

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How to find another Earth

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WFIRST space telescope. Image: NASA

The search for a second Earth

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An artist's rendering of a view from the surface of one of the three planets orbiting the cold dwarf star TRAPPIST-1 40 light-years away. CREDIT: ESO/M. KORNMESSER

Three planets with potential for life orbit a cold red dwarf close to the solar system

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