Thread:Horakoeri/@comment-1743498-20130221213650

"Kray, could you perhaps, if you have the time, place a comment on my wall regarding the topic of how many planets can be inside the habitable zone of a solar system? I'd like to know the answer of two scenarios, one with earth-sized planets and one with moon-sized planets. Thanks in advance if you could do this and sorry for posting it here." -- Going off what we currently know about the habitable zone, three habitable planets in one system seems to be the maximum. However, three is extraordinarily rare and requires very precise conditions. Two is also rare, but we have such a setup in our own solar system. It's been recently discovered that Earth is at the near edge of the habitable zone, while Mars is just past the middle.

Generally, the larger the planet, the less room there is for other close by planets due to the elliptical orbits and gravity wells. Three moon-sized planets could fit neatly within the habitable zone. Two Earth-sized planets would work, though the second one would likely be significantly smaller around the size of or slightly bigger than Mars. 