It's free to get in. There is a cost for parking and some special activities in the center.
Free to enter and see most of the facility and activities. Count on about ten bucks to park, and there are ticket fees for special exhibits, the planetarium shows, and the movies.
It depends on events
You can park in the park but you have to walk. The durry hotels have free passes to some exhibits and the movies if you stay with them
There is free parking on the Forest Park Planetarium side if you can get there and snag one...
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