How does it work?

Internally, the mod runs through each planet and space location in the game, checks each asteroid in its orbit, then checks if the size of that asteroid should be reduced, depending on the setting (either for that specific size, or for that tier of planet).

Then, depending on which planets were affected, checks for routes between those planets, and reduces the size of the asteroids on that route to the larger of the two endpoints.

Compatibility with Asteroid Frequency Multiplier

Safer Asteroids runs before Asteroid Frequency Multiplier, so any changes to each planet's asteroid sizes apply first, then the asteroid multipliers will be applied to the new sizes.