The more rockets you launch, the more junk there is in orbit. You can't get much science with that in the way. Put up a net to clear a path
Mods introducing new content into the game.
Counted when a user downloads a mod release for the first time. Before Nov 2021 it counted everytime a user clicked the mods download button.
Counted when a user downloads a mod for the first time. Has no data before Dec 2022