Are We Alone How the Universe Works

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There are billions of stars in our galaxy, with billions of planets circling them. But, as far as we know, only one planet has life: Earth. But are we really alone? • Stream Full Episodes of How the Universe Works: • https://www.sciencechannel.com/tv-sho... • Subscribe to Science Channel: • http://bit.ly/SubscribeScience • Like us on Facebook: •   / sciencechannel   • Follow us on Twitter: •   / sciencechannel   • Follow us on Instagram: •   / sciencechannel  

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