According to NASA, it will be really close.

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NASA plans to smash its DART mission spacecraft with an asteroid on September 26 to explore how it impacts asteroid motion. Meanwhile, a massive space rock is headed toward Earth.

This asteroid will make a terrifyingly close approach to our planet tomorrow. 

NASA's Asteroid Watch Dashboard says 2005 RX3 is 390 feet wide and will pass close to Earth.

NASA's JPL classifies as potentially hazardous any asteroid within 4.6 million miles of Earth and greater than 150 meters.

This asteroid will pass close to Earth tomorrow, but it could be pushed off course at the last minute and aim for Earth.

The likelihood of it happening, though, is extremely slim.

Some expensive technology are used to monitor as many asteroids as possible.