An unusually large asteroid that just skimmed by Earth had its own moon, NASA has said as the US space agency released its first radar images of the flyby.
The asteroid known as 2004 BL86 made its closest approach late on Monday at a distance about three times further than Earth’s own Moon.
Radar images from NASA’s Deep Space Network antenna in Goldstone, California show that the asteroid itself was about 150 metres smaller than expected, and measured about 325m across. The asteroid’s small moon was approximately 70m across.
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