Finding another Earth outside our solar system would be big news - but there are some surprising discoveries in our very own cosmic backyard.
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First published on Thu, 12 Apr 2007 as The Cosmos: A Beginner's Guide - Other worlds. To find out more visit The Open University's Openlearn website. Copyright 2007
First published on Thu, 12 Apr 2007 as The Cosmos: A Beginner's Guide - Other worlds. To find out more visit The Open University's Openlearn website. Copyright 2007