Will rain ruin my trip to the Space Museum?

I’m planning to drive up to Huntsville from south Ga today, and visit the museum either Friday or Saturday (27th or 28th of December). Unfortunately, the forecast is showing 85% chance of rain Friday and 70% chance for Saturday. Would this ruin or at least cause me to miss out on some of the exhibit? How much of it is indoors vs. outdoors? I’m an adult with no children, so I primarily plan to walk around and look at everything.

I check out of the hotel on Sunday, which is not showing rain, so I could just visit the museum then and drive home afterwards. Would this be a better idea?