But on Monday, Sept. 26 at precisely 7:14 p.m. ET, the attention of much of the astronomical community will be directed at Dimorphos. That’s the moment at which NASA’s DART spacecraft (short for Double Asteroid Redirection Test) will punch the moonlet in the nose—deliberately colliding with it at a speed of about 28,200 k/h (17,500 mph). The results of that cosmic crack-up could go a long way to determining how NASA and the world’s other space agencies can keep the planet safe from incoming asteroids: destroying or deflecting them before they can do the kind of cataclysmic damage that occurred when a 10 to 15 km (6.2 to 9.3 mi.) space rock crashed off the Yucatan Peninsula 65 million years ago, causing the global extinction event that spelled the end of the dinosaurs.
Source: https://time.com
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