Is there an entrance fee

Yes. About 35$

Yes there is. If your local and you have more than 3ppl with you it's best just to buy a membership. The exhibitions don't change as often as the museum of natural science and history but you'll get more bang for you buck if you get the membership if I'm not mistaken the exhibits change every 6 months so your best bet would be to find out when the current exhibition is due to end and try and plan your purchase around that. If you plan it right you can catch the end of this one have the next and the beginning of one more before your membership expires.

Yes

Oh Yes