Earth may now have viable defence against planet-killing asteroids, NASA says
, head-on into the space rock Dimorphos, forever changing its course.
The test was a success, and a slew of recently released analyses in Nature show that scientists are optimistic about the future of the planet-saving technology. While Dimorphos posed no risk to Earth, a day may come when another space rock will.
Scientists conservatively predicted that the rocket impact would shorten the period of time it takes for Dimorphos to orbit Didymos by seven minutes. However,on Wednesday reports that the test shortened Dimorphos’ orbit by a full 33 minutes. The investigation team, led by Cristina Thomas of Northern Arizona University, found that DART had a larger effect on the moonlet because of the material that ejected off its surface after the rocket impact. The “ejecta,” as it’s known, “contributed significant momentum change” to Dimorphos, “beyond that of the DART spacecraft itself.”
France Dernières Nouvelles, France Actualités
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