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It's happening, and soon: The Utah-based Megaplex Theatres chain will be adding another IMAX theater to its lineup — the one inside Salt Lake City's Clark Planetarium.

The ATK IMAX Theatre has been what's known as an "institutional" IMAX — as opposed to a "commercial" screen — one attached to a museum or science center, where the movies shown are more educational in nature (a k a field-trip fodder).

Starting soon, the Megaplex 12 at The Gateway will partner with the Clark Planetarium to program commercial films at night and on weekends. The first big program in the offing: "Harry Potter and the Deathly Hallows, Part 1," opening on Nov. 19 (and pictured above).

Megaplex already owns the other two IMAX screens in Utah: At the Megaplex 17 at Jordan Commons in Sandy, and the Megaplex 20 at The District in South Jordan. Megaplex is also putting an IMAX in its new 14-screen theater in Centerville (opening October 2011), and has a programming partnership at the large-format (but not IMAX) Mammoth Screen at the Museum of Ancient Life at Thanksgiving Point in Lehi.