Did you hear about the giant asteroid that could have destroyed an entire city that sailed by Earth on Sunday?

The asteroid was about the size of a football field, and we only had less than a day's warning of it's passing so close to Earth.

That in itself is terrifying. So, we really won't have any notice when a giant floating rock slams into our planet and kills us all. You know it's going to happen.

It was the largest known asteroid to ever come so close to Earth.

Here's a GIF of the asteroid flying by:


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