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Nuke that asteroid! Is that a good idea?
The potential consequences of a large asteroid impact could be devastating

Apophis Is Not Going To Kill Us After All | Highlights from S2EP10
Roboticist Matteo Borri shares a thrilling tale of tracking the asteroid Apophis and how things went from “averting disaster” mode to realizing a rare opportunity to observe it more closely.

How can humans protect the Earth from devastating asteroid and comet impacts?
"Next generation RADAR" will use the NSF's Green Bank Telescope and other facilities for planetary defense