Mars to Stay it is assumed the planet will be a magnet for settlers as wage costs will be high. Because of the labor shortage on Mars and its subsequent high pay-scale, Martian civilization and the value placed upon each individual's productivity is proposed as a future engine of both technological and social advancement. In the fifth chapter of "Mars Direct", Zubrin addresses the idea that radiation and zero-gravity are unduly hazardous. He claims cancer rates "do" increase for astronauts who have spent extensive time in space, but only marginally. Similarly, while zero-gravity presents challenges, near total recovery of musculature and immune system
A Beautiful Planet as "The Great Dying"). Like the force fields which protect fictional spaceships from damage, Spaceship Earth has a very real magnetic field which prevents cosmic rays and the stream of charged particles emitted by the Sun from harming living beings on Earth. In the narrative words of "A Beautiful Planet", the glowing, curtain-like auroras that the astronauts admire in the film "show that shield in action. Because we have this magical magnetic field protecting us, we have our forests, and oceans, animals, and people. It's why ours is a planet of life." Our neighboring planet Mars, on the other hand,