Salvation is a terrific series about what could happen if the world learned an extinction-event sized asteroid was on a collision course with Earth. It does a great job researching how governments, the public, and hacktivist groups might respond to such news. (For instance, one government might try to send up something that would cause the asteroid to change course just enough to make it crash into a spot on the other side of the planet in order to minimize the damage in their country. This could cause world powers to consider nuclear warfare to stop that from happening.)

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