The universe is hiding something. In fact, it is hiding a lot. Everything we experience on Earth, the stars and galaxies we see in the cosmos—all the “normal” matter and energy that we understand—make up only 5% of the known universe. Find out how scientists are discovering new secrets about the history of the universe, and why they are predicting a shocking future.

Originally released by PBS, 2018. Streaming video file encoded with permission for digital streaming by Infobase on August 29, 2019.

Introduction: What's the Universe Made of? (1:31); --Opportunity for Insight (3:05); -- Underground Lab (2:09); -- Massive and Expanding (2:23); -- Early Universe (8:33); -- Effecting Optics (5:26); -- Undiscovered Particle (3:35); -- Capturing Theory (6:12); -- Unanticipated Findings (6:36); -- Unknown Force (6:39); -- Cosmic Struggle (3:49); -- Credits: What's the Universe Made of? (1:05); .