HomeSpace NewsHow big must an asteroid be to end human civilization?

How big must an asteroid be to end human civilization?

Space rocks burning up in Earth’s atmosphere are the cause of beautiful shooting star displays. When these occur, you are meant to close your eyes and make a wish. But when the incoming meteorite gets too big, the only wish you can reasonably make is not to be anywhere near its impact site. 

But how big must an asteroid be to no longer be just a mesmerizing sight? What size is big enough to wreck a whole city or a continent? And what else does the damage depend on?

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