As 4 astronauts head to International Space Station after a week's delay, NASA expects space tourism to soon make the tally soar

NASA astronaut says situation is 'suboptimal' but manageable during 20 hour-period she and her crewmates will be in capsule

'That was a heck of a ride for us, and we're just getting started,' says billionaire captain Jared Isaacman, following 3-day mission

Rocketship remains standing after six-minute flight that follows four test flights that ended in fiery explosions before, during or soon after landing

The 167-day mission -- the second astronaut flight for Musk's company -- was the longest for a crew capsule launching from the US

Latest test of spaceship Elon Musk plans to send people to the moon and Mars declared a success

'We had another great flight,' official says, 'We've just got to work on that landing'

Seats are $55 million each; Tom Cruise, who is interested in filming movie at site and was mentioned as potential crew member, will evidently have to wait for next Axiom flight

As electric car company's stock price soars, CNBC estimates the South African-born magnate's wealth at $185 billion

Despite explosion, Elon Musk hails test of rocket intended to take men to Mars as a great success, says they got all the data they needed