'Potentially hazardous' Asteroid (52768) 1998 OR2 to pass Earth
A giant asteroid classified by astronomers as "potentially hazardous" is set to become the largest to pass earth this year.
The two-mile-long rock is expected to race past on Wednesday, coming within 4 million miles of the planet.
Called Asteroid (52768) 1998 OR2, is thought to be travelling at almost 19,500 miles per hour.
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