SpaceX founder Elon Musk said he was "overcome with emotion" after NASA astronauts Robert Behnken and Douglas Hurley launched into space on Saturday.
The pair are on their way to the International Space Station (ISS) on a rocket and capsule system built by the billionaire entrepreneur's firm.
He said: "I think this is something that should really get people right in the heart - anyone who has a spirit of exploration. "I am really quite overcome with emotion - it's kind of hard to talk really. "It's been 18 years working towards this goal.
It's really hard to believe that it's happened. "This is a craft made by humans, for humans, I think it's something humanity should be proud about occurring on this day." The Falcon 9 took off on
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