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Asteroids the size of 2010 WC9 collide with our planet once every 6,000 years according to astronomers, and now, there are no known asteroids known to be on a collision course with the earth. The WeekFacts.com reported about the space rock on last Saturday. According to calculations at NASA, this will be the asteroid's closest Earth flyby in almost 300 years.

In accordance with NASA's Jet Propulsion Laboratory, this will be the closest it will arrive in 300 decades. Just recently, asteroid 2018 GE3 zipped by our planet and barely missed hitting it, and it was discovered only after it had already passed. According to EarthSky, it will fly past our planet at about 28,655 miles per hour. This giant rock, whose size could be between 60 and 130 meters, will pass at about 200,000 km from earth, a distance less than half that separating us from the Moon. The space rock was only recently rediscovered.

This might seem like a long way away from us, but it is actually one of the closest known approaches of an asteroid of this size. It was first discovered back on November 30, 2010 by the Catalina Sky Survey in Arizona, but disappeared soon after and its orbit could not be determined. Since there wasn't enough observational data to calculate its full orbit and predict its return, astronomers moved on to other space objects and the matter of 2010 WC9 was closed. The asteroid measures between 197 and 427 feet in diameter. You can also watch it by visiting the Slooh website tonight at 8 p.m. ET. The broadcast will be less than 25 minutes in duration, as the asteroid will cross our field of view within that period of time.

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Though asteroid 2010 WC9 isn't all that big in relative terms, it is significantly larger than the Chelyabinsk meteor that entered Earth's atmosphere and exploded 19 miles above Russia's Chelyabinsk Oblast region with the force of 500,000 tons of TNT. Our display will update every five seconds.

You won't be able to see the asteroid with the naked eye, but a telescope pointed in the right place at the right time will show a bright light moving across the sky.


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