Two asteroids made close flybys of Earth on Monday (Sept. 14), in both cases showing a common occurrence that didn't put our home planet at any risk.

The first space rock, a bus-size asteroid called 2020 RF3, whizzed by our planet 58,500 miles (94,000 kilometers) away at 2:49 a.m.

EDT (0649 GMT), according to the NASA Jet Propulsion Laboratory's Center for Near Earth Object Studies.

A few hours later, a smaller, car-size asteroid 2020 RD4 made a similar close pass at 65,700 miles (roughly 106,000 km), at 4:33 p.m.

Video: Bus and car-size asteroids zip by Earth on same day.

NASA and a network of telescopes keep a close eye for any dangerous space rocks through entities such as the NASA's Planetary Defense Coordination Office.

A recent well-known incident saw a six-story object breaking up over Chelyabinsk, Russia in 2013, which caused building damage and some injuries.

Scientists do regular study of asteroids with telescopes and, where possible, use spacecraft data to supplement their understanding!

Meanwhile, the Japanese Aerospace Exploration Agency has a mission of its own, Hayabusa2, that is en route from asteroid Ryugu for a landing on Earth on Dec.