Does anybody know what is need to settle yellow and red planets.

[lockstep]

Originally posted by Arnelos
Emergency construction of outpost ships is especially important for Magnate Civs... if you spot one, plop an outpost ship on it ASAP. Yeah, it'll still take another 3-4 colony ships to actually use the magnate civ, but at least no-one else will take it while you're busy with other stuff (as long as you care to defend it, that is...).

IIRC, other races can also drop outpost/colony ships on a planet as long as your outpost hasn't grown into a full colony. And the first race that reaches a population of 1000 gets control of the planet - along with control of the other races' population.