An asteroid will make its closest pass by Earth at around 2:24 pm ET, flying about 17,200 miles above Earth's surface. It's estimated to be about 150 feet (45 meters) across with an estimated mass of 130,000 metric tons.
Experts say it won't hit the planet, but its flyby is the closest ever predicted for an object this large, according to NASA. The asteroid, called 2012 DA14, will fly between Earth and the satellites that ring the planet 22,200 miles up.
Scientists think there may be 500,000 asteroids the size of 2012 DA14, but less than 1% have been located.
Get complete coverage of the asteroid flyby on CNN.com, CNN TV and the CNN Mobile apps.
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