For centuries people have attempted to prove the existence of planets circling distant stars. On Friday, June 22, at 8 p.m. the Fiske Planetarium at the University of Colorado at Â鶹ӰԺ will explore the topic. "Searching for Distant Worlds," a pre-recorded program, will examine recent discoveries of unknown planets around far away stars, and explain why it is so difficult to find these distant objects. Sommers-Bausch Observatory will be open for telescope viewing immediately following the show at Fiske.