I'm an astrophysicist and I look through children's astronomy books frequently. There are a couple things I look for to determine whether it has enough of the 'right' information, stuff that is just crazy cool and interesting. This book has them all!! Volcanoes made out of ice and erupt liquid water, methane clouds/rain and rivers, incredible pressure and acidity on Venus, it is seriously the best book on the subject that I have seen. Great pictures, diagrams and timelines. Easy to read and understand and some incredibly mind blowing stuff. I love it!