A football field-sized asteroid missed slamming into Earth Tuesday by approximately half the distance to the moon.
Asteroid 2010 WC9 was estimated to be one of the closest passes ever observed, according to earthsky.org.
It is three- to five-times the size of the 2013 Chelyabinsk meteor that exploded over Russia, leaving 1,500 injured.
Earthsky.org estimates the flyby is the closest in three centuries.
Asteroid 2010 WC9 is only a fraction of the size of the rock that caused the mass extinction event that killed off the dinosaurs.
That asteroid was estimated to be roughly 10 kilometres wide.