Great children's science museum - lots of hands on activities and room to run around. We were there on a Saturday, and it wasn't that crowded. Super space exhibit with "Moonwalker" where you are harnessed in and "fly" around, practicing what it is like in space. Google Earth table where you can aim and zoom to find your house anywhere on the planet. We were there with relatives with 2 children, 5 and 7, and it was perfect.
The only disappointment was the planetarium show. Instead of being a regular, age appropriate, planetarium show (we saw "stars" - sounds innocent enough!) where you see the night sky and they explain things, it was an IMAX type show with wild flashing lights, fast moving objects, and gratuitous spinning (even the adults had to look at the horizon of the theater to keep from feeling dizzy). The info was fine, but the visual part wasn't age appropriate for small children. They were scared, the younger one cried, and a family next to us left in the middle with their young one. Also not for those who get motion sickness. Seems that quiet contemplation of the night sky has given way to the over-stimulation world of video games, movies, and IMAX theaters.
Other than that, we all had a great visit!!