Water ice has been found at craters at the lunar north pole, which opens up the possibility of creating a nearly self-sustaining colony which can create rocket fuel, and agricultural and drinking water with great ease.
"Tons of ice found on the moon:"
|Ice in Martian|
Caves on both the Moon and Mars, spotted by openings called "skylights" where lava tubes broke open to the surface offer three incredible bonanzas if colonies are located inside such caves: Shielding from radiation; shielding from meteoroid/micrometeoroid impacts; and like on Earth, such caves will be at a fairly constant, average temperature which will greatly reduce heating and cooling needs.
These are truly exciting discoveries, for they will make long-term visits or colonies far easier and less expensive--and even more interesting!