The ancients imagined the earth was the central point of the universe. Newton’s discovery showed us that this is true, but it is not the complete truth. The earth is the center of a web of force that touches the moon, the sun, the other planets, and perhaps even all those distant stars that burn so far away. But every other moon, sun, comet, planet, and star is itself a center, and exerts its own force upon all the rest. Nothing in the universe stands alone.
