I was told I should post this tip. The Aid the Planet missions you get doing explore in clusters can be saved. Then after you complete your explore set, and you are out and about, then you buy the stuff needed for the Aid the Planet. And you can complete it when you go in to do another set of explore missions, in the same cluster where you got the Aid the Planet missions.
As I am leveling up, I do alot of explore for my gear, and I always end up getting a fair amount of the Aid the Planet missions. Even saved up to 3 at a time, then you can complete an explore set in seconds.