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How to watch online as a huge asteroid flies by Earth today

Amateur astronomers will be able to log on to get a front row seat for what's shaping up to be a very close call -- in space terms -- later today.

A ginormous space asteroid about the size of a full city block is heading our way today, and you can secure a front row seat online to watch as it zips past the Earth later.

The asteroid, known to astronomers as 2012 LZ1, is expected to pass within 14 lunar distances of Earth, or roughly 3.35 million miles. In space terms, that's a relatively close call, though still far enough way so as not to ruin your summer plans.

The Slooh online skywatching service, which has a telescope set up on the Canary Islands, plans to stream the footage live starting this evening at 8 p.m. ET. The asteroid is estimated to be between 1,000 and 2,300 feet wide.