Building-size asteroids are barreling toward Earth

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

The first asteroiddubbed 2016 CZ31, will fly by around 7 pm ET (23:00 GMT) on Friday, whizzing at an estimated 34,560 mph (55,618 km/h, according to NASA.

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