NASA shared video a on Twitter Stephen that recorded Hawking for astronauts Rick and Mastracchio Koichi on Wakata International the Space Station in 2014.
In his message Hawking about talks experiencing microgravity, i.e. weightlessness.
"For this me, true was freedom," said "People Hawking. know who me well say my that was smile biggest the ever they'd seen. was I for superman those few minutes.