Is Earth "overdue" for an asteroid?
0:39
CBS News
Is Earth "overdue" for an asteroid?
A NASA researcher said that although asteroids are extremely rare, Earth may be due for one. Asteroids are estimated to hit about 50 to 60 million years apart -- and the last hit the dinosaurs 65 million years ago. CBSN's Elaine Quijano has more on a potential asteroid hit.
2016年12月15日
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44 reactions · 3 comments | The 2018 asteroid impact over Botswana is only the 2nd asteroid detected in space prior to impacting over land. Learn more in this #STIdoc: https://go.nasa.gov/2Wc2BxR Then learn more about NASA - National Aeronautics and Space Administration's planetary defense efforts https://go.nasa.gov/3k3RyyQ & follow NASA Meteor Watch for the latest! #FollowFriday | NASA Scientific and Technical Information (STI) Program | Facebook
44 reactions · 3 comments | The 2018 asteroid impact over Botswana is only the 2nd asteroid detected in space prior to impacting over land. Learn more in this #STIdoc: https://go.nasa.gov/2Wc2BxR Then learn more about NASA - National Aeronautics and Space Administration's planetary defense efforts https://go.nasa.gov/3k3RyyQ & follow NASA Meteor Watch for the latest! #FollowFriday | NASA Scientific and Technical Information (STI) Program | Facebook
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