Are We Alone? | How the Universe Works

Are We Alone? | How the Universe Works

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-shows/how-the-universe-works/

Subscribe to Science Channel:
http://bit.ly/SubscribeScience

Like us on Facebook:
https://www.facebook.com/ScienceChannel

Follow us on Twitter:

Follow us on Instagram:
https://www.instagram.com/ScienceChannel/