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ESA's Hera Arrives at Didymos: Completing the World's First Planetary Defence Test
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ESA's Hera Arrives at Didymos: Completing the World's First Planetary Defence Test
On September 26, 2022, NASA's Double Asteroid Redirection Test (DART) spacecraft slammed into Dimorphos, the moonlet of the near-Earth binary asteroid Didymos, at approximately 6.6 kilometres per second. The 570-kilogram spacecraft successfully changed Dimorphos's orbital period around Didymos by approximately 33 minutes, shortening it from 11 hours and 55 minutes to 11 hours and 22 minutes. That was roughly 25 times more change than the minimum…
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