The Catstronauts have successfully saved the world from an energy crisis in the first book, and now they're about to be shown up by the Russian Cosmocats in the space race to Mars! Which begs the question, if the Russians (and the Germans and the Italians) have rockets ready to go, why was it up to the Catstronauts to build the solar powered moon base? I still have problems with the solar powered moon base, don't get me started.
Again, the science is ludicrous. I really want it to be better, because these books are cute and fun and there's no reason we also can't sneak a little credible science into them for younger readers. I also wish NASA had the budget these cats seem to-- "quick, assemble another rocket so we can go rescue the Catstronauts stranded just outside Mars' orbit!"
That's not how it works. That's not how any of this works.
3 stars though, because I like the creative problem solving at the end, and the coming together as scientists, despite the fact that they were cats from different countries. We need more of that, so high five for the warm fuzzies.