Building-sized asteroids hurtle toward Earth

Building-sized asteroids hurtle toward Earth

Two skyscraper-sized asteroids are zooming toward Earth this weekend, with one making its closest approach on Friday (July 29) and the other whizzing past on Saturday (July 30).

The first asteroidcalled 2016 CZ31, will fly by around 19:00 ET (23:00 GMT) on Friday, hurtling at an estimated 34,560 mph (55,618 km/h, according to NASA.

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