"If you make certain assumptions about the force of gravity, and how the weight of an object diminishes as it gets farther away, it's not improbable at all," Isaac said. "It just happens. You would keep going round and round forever." "In a circle?" "An ellipse." "An ellipse..." and here the bomb finally went off in his head, and Daniel had to sit down on the ground, the moisture of last year's fallen apples soaking through his breeches. "Like a planet." "Just so--if only we could jump fast enough, or had a strong enough wind at our backs, we could all be planets."