Fireball That Flew Over Japan in 2017 Was Tiny Piece of Giant Asteroid that Might One Day Threaten Earth

If you'd looked up into the sky in Kyoto, Japan, on April 28, 2017, you may have seen a preview of an event that could, far down the road, threaten the whole Earth.

via Livescience.com https://ift.tt/2BsWiIA