The discovery of a 2- to 3-kilometre-wide asteroid in an orbit that goes backwards has set astronomers scratching their heads. It comes closer to Earth than any other object in a 'retrograde' orbit, and astronomers think they should have spotted it before.
The object, called 2009 HC82, was discovered by the Catalina Sky Survey in Arizona on the morning of 29 April.
The object, called 2009 HC82, was discovered by the Catalina Sky Survey in Arizona on the morning of 29 April.
Full article by Jeff Hecht on NewScientist
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