The 3. 5 minutes Spaceship One (SS-1) spent in space, 100 kilometers above the earth, was a big step for tourist flight beyond the outer space.It landed safely back on a runway in the Mojave Desert in California,about 160 kilometers north of Los Angeles, where thousands gathered.“The sky was jet black above, and it got very blue above the horizon(地平线),”said pilot Michael Melville, 63. The flight made the test pilot the world's first private astronaut.“The flight opens a new chapter(篇章) in history, putting space within the reach of common citizens,” said Patti Smith, US Federal Aviation Administration associate head of commercial space transportation.