Free Astronomy Magazine May-June 2018

4 PLANETOLOGY Illustrators and designers have almost always represented future human settlements on the Moon and Mars in the form of modular structures easily visible from above. It is instead very likely that the first extrater- restrial bases will be hidden underground, within geological formations capable of defending the settlers from the dangers of outer space. Lunar and mar back to the ca by Michele Ferrara revised by Damian G. Allis NASA Solar System Ambassador MAY-JUNE 2018