Pet Rock 2 makes planetary science beautiful and accessible.
Start with a simple rock in space; end with a completely unique exoplanet. Choose your star type, adjust the parameters of your planet's orbit and chemical makeup, or bombard it with meteorites and see what happens! Watch your planet grow and change--and if the conditions are right, watch as it develops life. Make gas giants with crushing atmospheres and a dozen moons, a tidally-locked ice planet, densely populated terrestrial worlds, and more. It's all up to you!