3颗小行星,其中一颗比华盛顿纪念碑还大,
Three?asteroids,includingonethats?largerthantheWashingtonMonument,aresettosafelyflypastEarthonChristmasDay,accordingtoNASAsCenterforNear-EarthObjectStudies. Thelargestspacerock,knownasasteroid(SD),?is?slated?to |
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