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A big asteroid with its own moon is passing by. Here’s how to spot it – CNET

A rendering of a binary asteroid system European Space Agency A “potentially hazardous” asteroid and its smaller sidekick are zipping by Earth Saturday, and both amateur and professional astronomers are checking out the rare sight. The unnamed space rock designated as Asteroid (66391) 1999 KW4 is a binary system, meaning it’s composed of one large asteroid orbited […]

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