According to his calculations, the universe had gone through a monumental expansion in its first moment of existence. At the age of a trillionth of a trillionth of a trillionth of one second—or 1/1,000,000,000,000,000,000,000,000,000,000,000,000th of a second—the universe had expanded ten septillion-fold—or to 10,000,000,000,000,000,000,000,000 times its previous size.