And your daughter is only 8? Damn, nice job on the parenting. Might I ask what you've done as a parent to help get her to the point where she's asking these sorts of questions?
Early on I did show her how to use the Google Now to ask questions - like how far is the Moon & like. That's about all the parenting I have done in this regard. She has been watching way too many How Stuff Works videos lately - I want to see if that spills over into her being more curious about things.