This will use an American rocket plane developed by California's Scaled Composites company to send fare-paying passengers on sub-orbital trips.

这个项目将使用一个是由加利福尼亚的Scaled Composites公司发明的美国火箭飞船将付费乘客送往太空亚轨道旅行。

youdao

Or all the other more then 20, 00 pieces of orbital debris like Spent Rocket Boosters left in space that can no longer be moved by a control center on Earth.

FORBES: 'Doomsday Asteroid' Bigger Than Expected

It said that, although Nasa was taking steps to protect the shuttle from orbital debris such as spent rocket bodies, satellite fragments and paint chips - there was a real risk that a collision could cripple the shuttle or threaten the safety of the crew.

BBC: Was Columbia struck by space debris?

Orbital Sciences survived by developing a new rocket launched from a far more reliable platform, a jumbo jet.

FORBES: Iridium for truck trailers