Clicking the asteroid's core, you can filter out a specific type of seedlings.
Watching a Dyson tree grow
Determine how many seedlings to send out.
Four asteroids have been colonized.
First take down the trees, then move in to the core.
The entire belt has been conquered and some asteroids have defensive trees.
One of the skirmish levels
Grey asteroids remain undiscovered.
The Dark Matter mode where the A.I. is much smarter.
Note the path : asteroids can reach out only up to a certain distance.