This one gave me some trouble. I have version 16 of Illustrator and therefore could not follow the Corner Widgets tool (in v. 17 I guess?), making the edges a better round shape per the tutorial. The round corners menu did not want to make the edges actually round and did it to the shape as a whole. I’m wondering if I should have applied it to each box before merging them together. I’ll have to try that next time.
Here is the tutorial I used. Loving the bright neon colors for the planets and I got to play with the shape tool to create stars, similar to the previous project.