Normal matter—the kind that makes up our home planet and everything we can see—adds up to just five percent of the known universe. The other 95 percent is dark matter and dark energy, a tag team that ranks among the biggest mysteries in all of science. NASA astrophysicists Jason Rhodes and Ami Choi explain how we study this dark side and why it's making scientists reconsider what we think we know about the universe. NASA's Curious Universe is an official NASA podcast. Discover more adventures with NASA astronauts, engineers, scientists, and other experts at nasa.gov/curiousuniverse