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The ISS is far bigger than either the Salyuts or Skylab. In an uncontrolled deorbit, pieces of debris “up to car and train size,” say experts on the official ISS space station advisory committee, will rain down from the sky. NASA confirms this would pose “a significant risk to the public worldwide.”
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Scientists have captured a beautiful image in unprecedented detail of the vast Milky Way galaxy, of which our own solar system is a part.，这一点在爱思助手下载最新版本中也有详细论述
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