National Geographic Society

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Alien Earths

So far, nearly all of the planets weve found are within the disk of the Milky Way. One world sits in a globular star cluster far above the plane of the Milky Way.  It is the oldest planet known, a 12 billion year relic from the dawn of time. It has an extraordinary story that includes hopping from one star to another and surviving a supernova blast.
The reality of new worlds discovered beyond our solar system is stranger than science fiction could have ever imagined.