Astronomer Geoff Marcy is the Usain Bolt of planet hunters, but now he is turning his gaze towards potential alien civilisations. The good news, he tells Anil Ananthaswamy, is that ET may already be ...
Add Yahoo as a preferred source to see more of our stories on Google. The Milky Way galaxy has more than 400 billion stars in it. Over the last few decades, astronomers have discovered that almost ...
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