How much is the fee

You can pay whatever you want, but it certainly is worth paying the full admission price. That being said, it can be expensive if you have a large family so you can pay whatever you can afford. Also, if you want to skip the lineups just download the app and buy your tickets in the app. You'll get an e-ticket which will get you into the exhibition halls immediately. But then you have to pay the full suggested amount.

A full adult admission to planetarium and imax costs $23, $18 for kids. However you can get tickets to see 98% of the exhibits for any donation you want to make. Today my family of 4 went in for $10 each.

As much as you want to pay, suggested donation is $23.

Its donation or 23$ in general