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Binary asteroids, key to Earth’s planetary defence

Written by  Copernical Team Tuesday, 04 June 2019 13:36
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Humankind has had its closest look yet at a binary asteroid. As 1999 KW4 skimmed past our planet at 70 000 km/h, the most advanced visible-light telescope on Earth resolved the 1.3-km diameter asteroid and its 360-m sized moon. An even closer spacecraft-based encounter will come next decade, when NASA will send a probe to deflect the moon of the distant Didymos binary. Then ESA’s Hera mission will perform a follow-up survey right down to the body’s surface....

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