Science
Is it an asteroid or comet? This strange solar system object is actually both. – Space.com – Canberra Online News
2005 QN173 isn’t just any old asteroid.

Scientists have identified a rare solar system object with traits of both an asteroid and a comet.The object, dubbed 2005 QN173, orbits like any other asteroid, but most such objects are rocks that don’t change much as they loop through the solar system…….
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