ssweeny quoted A City on Mars by Kelly Weinersmith
Earth is not well. The promise of starting life anew somewhere far, far away - …
A human is, to a first approximation, a pillar of liquid about two meters high, in which are suspended various moist and jiggly biological systems — digestion, waste storage, sense of balance, the movement of blood. All of these systems evolved in an environment where a 6-billion-trillion-ton sphere called Earth sat at the pillar's foot.
— A City on Mars by Kelly Weinersmith, Zach Weinersmith (Page 43)
Most of this book is about how settling space is much harder and less desirable than most people think. I'm glad it's so funny because otherwise it would be too depressing for my nerd brain.