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CygnusX-1
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The first asteroid ever seen from another solar system is whizzing through our own, and astronomers are racing to observe the visitor before it slips away.
Links: Nature
http://www.skyandtelescope.com/astronomy-news/astronomers-spot-first-known-interstellar-comet/
Links: Nature
http://www.skyandtelescope.com/astronomy-news/astronomers-spot-first-known-interstellar-comet/