🎥 What is a near-Earth asteroid? How many are there? Where do they come from? And why should we care about them? This video answers these questions and more… #AsteroidDay2018 #PlanetaryDefenders https://t.co/GzYWB865n1https://t.co/kktfCPlzqu pic.twitter.com/oR3OsHvkK9
— ESA (@esa) June 30, 2018
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