Merrillville Community Planetarium presents "Comet: From Ice to Fire," a public program Oct. 18, 19, 25 and 26. Additional showings may be added if needed. The planetarium opens for seating 30 minutes before the show begins. No one will be admitted after the program starts. Comet C/2012 S1 — known as Comet ISON — will plunge through the sun's outer atmosphere Nov. 28. If the comet survives, it will make a close approach to Earth on Dec. 26. This program will explore the history and nature of comets. Seating is limited and should be reserved by phone or online. Park and enter on the west side of the building.