NASA finds crashing spacecraft into asteroids is a viable defence strategy
Plumes of dust and rocks kicked up from the surface of asteroid Dimorphos after NASA's DART spacecraft smashed into it altered the space rock's orbit more than the kinetic impact alone, according to research published on Wednesday.
DART was a huge success. The impact from the collision with Dimorphos shortened its orbit by 33 minutes – it now takes less than 11 and a half hours to circle around its parent asteroid, Didymos. The change is significantly greater than had been expected. The spacecraft alone would have altered Dimorphos's orbit by seven minutes, but the recoil and ejecta created by the impact shortened it even further,estimated that the loss of material from the asteroid's surface contributed to the change in momentum by a factor between 2.2 and 4.9.
Belgique Dernières Nouvelles, Belgique Actualités
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