This is a research project where students gather research and write a short encyclopedia article about each planet. My third graders use their planet fun fact cards to complete this project. That project can be found in my TPT store. You can also just have them gather research out of nonfiction books or online sources and then write their encyclopedia articles. I use this as a science/literacy/writing center and it takes my students all week to complete their own encyclopedia books.
Images purchased from Scrappin Doodles. Thanks and happy teaching!