The Universe By William Botero Feb 19, 1473 Copernicus was Born Period: Feb 19, 1473 to Jan 1, 2000 The Universe Jan 1, 1541 Copernicus published a short austronomical manuscript Jan 1, 1604 Galileo's first know astronomical observation Jan 1, 1613 Galileo published his letters about sunpots based on observations he made Jan 4, 1643 Newton was born Jan 1, 1687 Newton published a book about mathematical principles of natural philosophy Mar 31, 1737 Newton died Nov 20, 1889 Edwin Hubble is born Jan 1, 1929 Hubble proves that the universe is expanding Sep 28, 1953 Hubble died