You can pay whatever you'd like for general admission. But there are special exhibits like the planetarium that you won't be able to see without paying full price ($23) plus the added price of the exhibit ($5 - $10). It's cheaper if you're a student, senior, young kid etc.
23$ for adults. Or if you stand in the huge lineup they have a pay what you want fee wbete you pay however much you feel like giving
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