Writer Quotes and aphorisms about gravity Harlan Ellison Nathan Englander Robert J. Sawyer ,, The single best thing about Mars is the reduced gravity. It's 38 percent of Earth's gravity - about... Alex Hirsch Alex Hirsch Alex Hirsch Michael Patrick King Trudi Canavan ,, The first rule of world-building is available physics, which basically means that if you want it to... Callie Khouri Alan Moore