An artist imagines what the surface of the planet Proxima b, orbiting the red dwarf star Proxima Centauri, might look like. M. Kornmesser/ESO/NASA hide caption

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M. Kornmesser/ESO/NASA

Why The Discovery Of An Earth-Like Planet Is Such A Big Deal

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In the Integration Facility at the Baikonur Cosmodrome in Kazakhstan, Expedition 48-49 crewmembers (left to right) Kate Rubins of NASA, Anatoly Ivanishin of Roscosmos and Takuya Onishi of the Japan Aerospace Exploration Agency prepared for a four-month mission on the International Space Station in this June 2016 photo. Alexander Vysotsky/NASA hide caption

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Alexander Vysotsky/NASA