Click on the green flag, and the open the project to discover The Cosmonaut sprite is from https://www.kindpng.com/imgv/iiwmJm_transparent-cartoon-astronaut-png-astronaut-space-suit-cartoon/
You can use the "broadcast blocks" for different tasks. Basically they are used to coordinate sprites. I tried different projects and, at the end I resolved to create a little tutorial on how to use blocks. It is very basic, I just outlined it due to time constraints. I hope it will be somewhat useful.
