很可能你看到的是一艘低轨宇宙飞船反射的太阳光，因为这些航天器每90分钟左右绕地球一圈。
What you are seeing, most likely, is a spacecraft in low Earth orbit reflecting back sunlight as it circles the Earth once every 90 minutes or so.
英国亿万富翁理查德·布兰森爵士向众人展示了其刚刚起步的商业太空旅游项目中的重头戏，揭秘了用来发射客用宇宙飞船的航天器。
British billionaire Sir Richard Branson showed off a key piece of his fledgling commercial space program, unveiling a spacecraft designed to launch a passenger-carrying spaceship.
成百上千的航天器发射到天空：从第一航空卫星，宇宙飞船，到现如今的航天飞机。
Hundreds of space vehicles have blasted into space: first satellites, then spaceships and now space shuttles.
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