An asteroid half the size of a football field buzzed Earth in a historic flyby today (Feb. 15), barely missing our planet just hours after a much smaller object exploded above Russia, injuring perhaps 1,000 people.
The 150-foot-wide (45 meters) near-Earth asteroid 2012 DA14 cruised within 17,200 miles (27,000 kilometers) of Earth at 2:24 p.m. EST (1924 GMT) today, coming closer than many communications satellites circling our planet.
The flyby marked the closest approach by such a large asteroid that astronomers have ever known about in advance. But it wasn't even the most dramatic space-rock event of the day.
VIDEO: GIANT Meteor Hits Russia!
That distinction goes to a brilliant fireball that exploded early this morning in the skies over Russia's Chelyabinsk region, which is about 930 miles (1,500 km) east of Moscow. The blast damaged hundreds of buildings and wounded perhaps 1,000 people, according to media reports. [Fireball Explodes Over Russia (Video)]
Scientists think the Russian fireball was caused by a object that was about 50 feet wide (15 m) and weighed about 7,000 tons before it hit Earth's atmosphere. For comparison, 2012 DA14 tips the scales at 140,000 tons or so. The two space rocks are completely unrelated, NASA researchers say, making the dual events a spooky cosmic coincidence.