First Planet From Outside Milky Way Discovered

Posted by on November 19th, 2010

Scientists have discovered a Jupiter-like planet inside the Milky Way that once belonged to another galaxy. This smaller galaxy was swallowed up by the Milky Way between six and nine billion years ago and belongs to a group of stars left over called the Helmi Stream. Nearly 500 planets have been discovered outside of our solar system, but this is first to have an extragalactic origin.


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