2003 SD220 is a large asteroid that passed by Earth on 24 December 2015. This image from NASA’s 230-foot (70-meter) Deep Space Network antenna at Goldstone, California on 22 December 2015. The 2.4 km / 1.5 mile long asteroid passed just 11 million km / 6.8 million miles which is pretty close in astronomic terms. It […]
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Telescopically 