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NASA just crashed a spacecraft into an asteroid to see what would happen

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The DART spacecraft is gone, but the science is just beginning.

a:hover]:text-black [&>a]:shadow-underline-gray-63 [&>a:hover]:shadow-underline-black text-gray-63″>NASA

A NASA spacecraft slammed into the surface of a distant asteroid at 7:14PM ET on Monday night, the climax of the agency’s Double Asteroid Redirection Test (DART).

Telescopes around the world (and a few in space!) are now turning their attention to the scene of the collision. They’ll be watching to see how much the impact changed the movement of the asteroid, Dimorphos. The crash is part of the first practical planetary defense experiment — a trial to see if humanity might one day be able to redirect the path of an asteroid headed toward our planet.

“We’re embarking on a new era of humankind, an era in which we potentially have the capability to protect ourselves from something like a dangerous hazardous asteroid impact. What an amazing thing. We’ve never had that capability before.“ said Lori Glaze, Director of NASA’s Planetary Science Division, soon after the impact.

To be clear, neither Dimorphos nor its larger companion asteroid, Didymos, pose any danger to Earth. No known asteroids pose a significant and immediate threat to our planet. But NASA is playing a long game. Someday in the future, if an asteroid is spotted on a dangerous path, the agency wants us to have options that could let us avert catastrophe.

The option that DART is testing is one of the most direct; if we slam something into an asteroid, will it change how that asteroid moves? Because Dimorphos’ orbit takes it between another asteroid (Didymos) and Earth, researchers will soon have an answer to that question.

Dimorphos is relatively small, so scientists couldn’t actually see the asteroid until just before the collision. But telescopes can see Didymos dimming every time that Dimorphos crosses between it and Earth. This lets researchers know how fast the asteroid is moving. They expect to see Dimorphos’ orbit speed up after the collision, but how closely the asteroid’s behavior will match the computer models remains to be seen.

Developing…

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