Astronomers Discover Asteroid Playing A Cosmic Game Of Chicken With Jupiter

International Business Times 

Most objects in our solar system circle the sun in what's known as a prograde orbit, wherein their motion is counter-clockwise when seen from "above." All but a handful of the million or so known asteroids in our solar system exhibit prograde motion -- a direction inherited from the spinning disk of debris that birthed them roughly 4.6 billion years ago. Graham, Arizona, have now discovered an asteroid orbiting the "wrong" way -- exhibiting retrograde motion -- around the sun. Moreover, this asteroid, 2015 BZ509 ("Bee-Zed" for short), also shares Jupiter's orbital space, making it the only known object in the solar system to have a retrograde orbit and to share a planet's orbital space. The observations were detailed in a study published Wednesday in the journal Nature.

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