Under "Duity Officers" In the Assignments Tab under Assignment Chains there is the mission, "Colonization of the Delta Volanis Cluster"

Are these random missions that pop up under Current Sector or is there a way for me to knock out all of these mission in a row?

I have the first mission complete (dont remember how I did it, "Colony Site Survey in the Delta Volanis Cluster" but how do I do the others?