Four huge asteroids — and a fifth that's much smaller — are passing Earth on Thursday in their closest approaches to the planet ever recorded.

"Asteroids are "bits of a planet that didn't happen" that orbit the Sun between Mars and Jupiter – the Main Asteroid Belt. However, as they are relatively small, asteroids have

Four "potentially hazardous" space rocks, which are between 100 and 580 feet across, will all make their closest approaches to Earth within less than 12 hours of one another on Thursday (Oct. 24). Two of them were only discovered earlier this month.

Four enormous asteroids, including one with the potential to wipe out an entire city off the map, are making a close flyby of Earth on Thursday. Deemed potentially hazardous, each will come within 30 miles of our planet in just a span of 12 hours.