Researchers at Columbia University have proposed using powerful lasers to mask the dimming of sunlight caused when Earth passes in front of the Sun, a signal aliens could use to detect our planet. The ...
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 ...
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