“But I was losing so much bone density that I would have been in grave danger. And I mean grave danger. If I had let it go just a few more years I could have broken my hip or spine just picking up my granddaughter.”
“Perhaps the best motivation for going to Mars is political. It is obvious that no single nation currently has either the will or the resources to do it alone, but a consortium of nations and space agencies could achieve it within 20 years.”