Building-sized asteroids are hurtling towards Earth

Two skyscraper-sized asteroids are heading towards Earth this weekend, with one coming closest on Friday (July 29) and the second passing on Saturday (July 30).

The first one asteroiddubbed 2016 CZ31, will fly around 7 p.m. ET (2300 GMT) on Friday, speeding around 34,560 mph (55,618 km/h, according to NASA.

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