What is Dark Energy?

Dark energy is an unknown form of energy which is hypothesized to permeate all of space, tending to accelerate the expansion of the universe. SPACE S DEEPEST SECRETS Tuesdays 9/8c on Science http://www.sciencechannel.com/spaces-deepest-secrets/ Subscribe to Science Channel: http://bit.ly/SubscribeScience Watch full episodes: https://www.discoverygo.com/science/ SPACE S DEEPEST SECRETS shares the stories of the men and women who pushed their ingenuity and curiosity beyond the limits to uncover some of the most groundbreaking findings in the history of space exploration. Facebook: https://www.facebook.com/ScienceChannel Twitter: https://twitter.com/ScienceChannel