'Potentially hazardous,' 500-foot asteroid set to zoom past Earth at 20,000 mph

A look at what NASA is describing as a 'potentially hazardous asteroid' that is on a 'close approach' towards Earth.

The enormous space rock, known as asteroid 2016 NF23 and estimated to be between 230 and 525 feet in diameter, will zip past Earth on Aug. 29 at a velocity of 9.04 kilometers per second, or approximately 20,000 miles per hour, the government space agency said on its Earth Close Approaches page.