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Portrait Of U.S. Sen. John H. Glenn Jr. in 1998, when he served as Payload Specialist For Space Shuttle Sts-95. NASA/Getty Images hide caption

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NASA/Getty Images

John Glenn, First American To Orbit The Earth, Dies At 95

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Visitors stand beside a model of the Tiangong-1 space lab in 2010, at the 8th China International Aviation and Aerospace Exhibition in Zhuhai, China. The real Tiangong-1 was launched into space in 2011 and will be returning to Earth next year — with some observers speculating China has lost control over the spacecraft. Kin Cheung/AP hide caption

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Kin Cheung/AP

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
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Why We're All Trapped In 3-D

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The pair of galaxies NGC 1531/2, engaged in a spirited waltz, is located about 70 million light-years away toward the southern constellation Eridanus (The River). R. Gendler and J.E. Ovaldsen/ESO/IDA hide caption

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R. Gendler and J.E. Ovaldsen/ESO/IDA

Does The Size Of Space Freak You Out?

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This artist's rendering shows what the view might look like from one of the three planets orbiting an ultracool, reddish dwarf star just 40 light-years from Earth. ESO/M. Kornmesser/Nature hide caption

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ESO/M. Kornmesser/Nature

3 Strange Worlds Circling A Cool Star Might Be Prime Spots To Support Life

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Stephen Hawking discusses the "Breakthrough Starshot" space exploration initiative during a news conference Tuesday at One World Observatory in New York City. Bryan Bedder/Getty Images for Breakthrough Prize Foundation hide caption

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Bryan Bedder/Getty Images for Breakthrough Prize Foundation

Stephen Hawking's Plan For Interstellar Travel Has Some Earthly Obstacles

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