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When I was a college student, I discovered a fantastic way to escape the summer heat: attending afternoon presentations at the University of North Carolina’s Morehead Planetarium. They were a lot cheaper than the movies, the seats were cushier, and the air conditioning was better. With the lights out, that projector thingy whirring, and the night sky twirling overhead, I forgot all about the unearthly temperature outside. The sweltering day I visited the Rock Creek Park Nature Center last summer, the results weren’t so satisfying. The planetarium was packed with small children, who mewled and pattered the entire show: “I’m afraid”; “Dad, there’s the Big Dipper”; “I’ve really gotta go.” I couldn’t wait to get back to my baking apartment, where I could at least suffer the heat in silence. Today’s program, however, promises to be different: “Treasure Map to the Heavens” is “intended for older audiences.” Try some heat-defying deep relaxation for yourself at 4 p.m. at the Rock Creek Park Nature Center, 5200 Glover Road NW. Free. (202) 426-6828. (Leonard Roberge)