Space's Deepest Secrets: Season 1, Episode 2 - ProjectFreeTV

1 - 2: Hunt for Dark Energy

Meet the scientists across the world on the hunt for Dark Energy, an unknown form of energy which is hypothesized to permeate all of space and may be accelerating the expansion of the universe. World scientists are searching for Dark Energy, the biggest challenge of physics. In Europe, a multi-billion dollar satellite will map the sky from space.