NASA's Jet Propulsion Laboratory says that a large asteroid will pass by Earth next month.
The asteroid, officially called 231937 (2001 FO32), measures from 0.8 to 1.7 kilometres in diameter.
It will whiz by Earth missing us by about 2 million kilometres on March 21.
It will be close enough and large enough to be classified as "potentially hazardous."
Small asteroids pass between Earth and the moon several times a month, and when they enter the atmosphere of the Earth their fragments break up almost daily.
Based on the known asteroids, there is no significant threat to Earth for the next 100 years.