NASA on Twitter: "Remembering Stephen Hawking, a renowned physicist and ambassador of science. His theories unlocked a universe of possibilities that we & the world are exploring. May you keep flying like superman in microgravity, as you said to astronauts on @Space_Station in 2014… https://t.co/bcCi0mnhD1"

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Remembering Stephen Hawking, a renowned physicist and ambassador of science. His theories unlocked a universe of possibilities that we & the world are exploring. May you keep flying like superman in microgravity, as you said to astronauts on @Space_Station in 2014pic.twitter.com/FeR4fd2zZ5

Professor Hawking Speaks with the Space Station in 2014

Astronauts Rick Mastracchio and Koichi Wakata aboard the International Space Station spoke with Professor Hawking during their mission in 2014. These excerpts courtesy of Arrow Media.

10:06 PM - 13 Mar 2018