Marietta College is hosting a Community Planetarium Show of Dark Matter Mystery at 2:00 p.m., Sunday, October 20th, at the Anderson Hancock Planetarium. This full-dome video explores why scientists think dark matter exists and how they are searching for it. Preceding the show will be a live star talk focused on the fall evening sky. The show is free and open to the public. Seating is available on a first-come, first-served basis.