Hubble discovers a unique type of object in the Solar System.

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http://sci.esa.int/hubble/59579-hub...-type-of-object-in-the-solar-system-heic1715/

20 September 2017
With the help of the NASA/ESA Hubble Space Telescope, a German-led group of astronomers have observed the intriguing characteristics of an unusual type of object in the asteroid belt between Mars and Jupiter: two asteroids orbiting each other and exhibiting comet-like features, including a bright coma and a long tail. This is the first known binary asteroid also classified as a comet. The research is presented in a paper published in the journal Nature this week.
 
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