Abstract

While belief in gods was almost universal in the ancient world, Thales of Miletus introduced the notion that observed phenomena could be explained in natural terms without invoking imagined spirits. Leucippus and Democritus, and later Epicurus and Lucretius, proposed that everything was composed of particulate atoms in an otherwise empty void. Any gods that existed played no role in the human world. The universe was infinite, eternal, uncreated, and included many worlds besides our own. These ideas conflicted with the other philosophical schools of the time and were suppressed by the Church during the Dark Ages. Atomism reappeared during the Renaissance and became a crucial ingredient in the scientific revolution that followed. The atomic picture of matter has now been solidly confirmed. Furthermore, the notion of an infinite, eternal, and uncreated ‘multiverse’ is strongly suggested by modern cosmology.