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Planetary Society

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Co-founded by Carl Sagan in 1980, The Planetary Society is a member-funded nonprofit organization dedicated to advancing space science …

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常见问题解答

问:
Should I be worried about asteroids hitting Earth?
答:
You shouldn’t lose sleep over it. Damaging asteroids do not hit Earth very often. But you should care about it, because dangerous asteroids have struck our planet...
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