航天任务
哈勃空间望远镜
Hubble Space Telescope
More than thirty years imaging the universe
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简介
Launched on 24 April 1990, Hubble orbits about 540 km above Earth. Its observations helped measure the expansion rate of the universe and discover that it is accelerating.
你知道吗？
It was repaired and upgraded in orbit by five Space Shuttle astronaut missions.