I love science and art, so I especially love it when we can find ways to combine the two. Earlier this year we did a unit on the solar system. As we studied each planet we looked at photos and learned about surface features and then made a watercolor painting. It ended up being so much fun, and one of our favorite projects of the year! You can grab free printable planet templates here: Solar System Coloring/ Watercolor Pack Below I share some fun facts and a couple online resources for each planet, and some more fun solar system activity ideas: Planet Facts The solar system has 8 official planets. 4 terrestrial or rocky planets, 2 gas giants, and 2 ice giants. Mercury - Mercury is the closest planet to the sun. It is a rocky planet covered with impact craters. It is the smallest planet, just slightly bigger than Earth's moon. A day on Mercury is equal to about 59 Earth days. A year on Mercury is about 88 Earth days. That's a pretty short year! Learn more about Mercury...