7, 8 and 9:30 p.m., Saturday, July 13, at Cernan Earth and Space Center, Triton College, 2000 Fifth Avenue, River Grove; 7 p.m., Our Place in Space And the Friendly Stars mini show; 8 p.m., Monthly Skywatch; and 9:30 p.m. Legends of Rock laser show. 7 OR 8 p.m. shows: $8 for adults and $4 for children and senior citizens. 9:30 p.m. show: $10 for adults and $5 for children and senior citizens. Special rates for multiple shows are available. 583-3100. www.triton.edu/cernan.