What is the mysterious Dark Matter that Astrophysicists think makes up 7 times more of the Universe than regular matter? Why would they think such a thing? And, of course, does it matter? On Saturday, March 16, the Cline Observatory at Guilford College will host a public open house, with a multimedia show in the Bryan Jr. Planetarium at 7:30 pm and a tour of the observatory to follow. If weather allows, visitors will be able to view luminous matter through the telescopes.