NASA's Dart Spacecraft Is Crashing Into an Asteroid on Monday. Here's Why and How to Watch
HOW WILL THE DART MISSION WORK?
Unless Dart misses — NASA puts the odds of that happening at less than 10% — it will be the end of the road for Dart. If it goes screaming past both space rocks, it will encounter them again in a couple years for Take 2.Little Dimorphos completes a lap around big Didymos every 11 hours and 55 minutes. The impact by Dart should shave about 10 minutes off that. Although the strike itself should be immediately apparent, it could take a few weeks or more to verify the moonlet’s tweaked orbit.
Planet Earth is on an asteroid-chasing roll. NASA has close to a pound of rubble collected from asteroid Bennu headed to Earth. The stash should arrive next September. Japan was the first to retrieve asteroid samples, accomplishing the feat twice. China hopes to follow suit with a mission launching in 2025.
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