Planetarium Shows May 1, 2011

Astronomers have found that most of the universe seems to be made of still mysterious "dark matter" that we cannot see but which reveals itself through gravity. There's also equally mysterious "dark energy" that seems to be speeding up the expansion of the universe. The universe of stars and galaxies may be only a small part of what's actually out there. Find out why astronomers think dark matter and energy are real, and how we might discover their natures!