Originally posted by soulby
if they are in a synchronous orbit like our moon is to the earth then it could be possible for there to be frozen water in the polar regions, hidden in craters or anywhere on the dark side of the terminator.
They think there is water ice on the moon, where the sun never shines, left over cometary impacts, if so it would be quite an incentive to making colonies on the moon. The same thing they think may be going on on Mercury, where the sun does not shine it is instant freezer and if a watery comet hits there, it could have surviving ice. Just lay on the sunscreen if you accidentally stick your head over the edge of the crater
So any planet almost however close to its parent sun and in a reasonably vertical orientation, that is to say, equator aiming at the star, poles perpendicular, there could be ice from cometary impacts. Not quite the same thing as being in the goldilocks zone though.
I think the biggest problem facing future lunar colonists will be not lack of water but lack of mineable metals. They think the moon came about from a collision with a mars sized planet and most of the iron went to earth and the moon got short shrift in that regard.