This toy is of very poor quality and barely works. The motor that turns the planets isn't very powerful, and often I had to physically give the planets a push to get them started on their orbits. When it does run it is very loud and distracting. And while the sun does light up, it's a very dim light barely brighter than a nightlight -- you have to turn the overhead light off to even tell that it's on.The planets are on flimsy wires and can fall off easily. It takes a steady and gentle hand to hold the mobile when changing the batteries to keep from knocking all of the planets off.My 4 year-old loves the planets and was dying to get this, but after only 6 months we've taken it down and he doesn't even miss it. Instead, he's taken the individual planets off of the mobile and plays with those on their own.