NASA will collide with an asteroid to protect Earth.

Dimorphos is a dull planet. It's a 160-m moonlet circling the 780-m asteroid Didymos. Didymos-Dimorphos is 11 million kilometres from Earth in the asteroid belt between Mars and Jupiter.

On Sept. 26 at 7:14 p.m. ET, astronomers will focus on Dimorphos. NASA's DART probe will purposely collide with the moonlet at 28,200 km/h (17,500 mph). 

Earth is in danger. NASA's Center for Near Earth Object Studies (CNEOS) tracks near-Earth asteroids (NEAs), which orbit the sun within 45 million km (28 million mi.) of Earth.

That seems like a safe miss distance, but space junk might impact with an NEA, altering its route and sending it our way.

 According to CNEOS's survey, there are 855 NEAs measuring at least 1 km and more than 10,000 measuring at least 140 m. CNEOS lists 29,801 NEAs of various sizes.

NASA constructed DART to intercept and deflect Didymos-Dimorphos on November 23, 2021, as a first test of the untested method. Dual spaceship

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