Fiction is filled with stories about death from above, space-based apocalypses that bring an end to human civilization, or threaten to. At this point, a last-ditch mission to stop an asteroid from destroying the planet has become a tired trope in movies. There was a time when asteroids were a pretty scary idea. We knew they were out there, we knew they could hit us because it has happened before, and we knew there wasn’t much we could do
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