If you really want to see for yourself, call ahead. Check that exhibits are open, renovations aren't happening and the Air Conditioning is working. I am serious. It was out for 2 weeks and no one told us when we called ahead.
Attractions and "Exhibits" were very cheaply done and poorly executed. The Laser Light show was boring. The staff was not helpful at all. When we asked about the A/C and if it was at least cool in the planetarium the guy said "I don't know, they don't tell us anything".
There was no room attributed to astronomy or NASA! (there is the roof, where the telescope is).
Parking was $5, admission was $13 and to get a soda from the cooler (when A/C was out!) was $2.40.
Not recommended at all. Very disappointing.