Do you need a ticket for the science museum in order to purchase the butterfly tickets? I just want to do the butterfly exhibit not the museum.

You can do just the butterfly exhibit....when you enter the building go to a kiosk and purchase your ticket for just the butterfly's

You can buy only the ticket for the butterfly center it costs $12 per person.

No. You buy them at the same place, but there different tickets for the science museum, planetarium and butterfly exhibit.

No, it's a separate exhibit