1781 : Discovery of Uranus by William Herschell



1796-1798 : Theory of Pierre Simon de Laplace who believes that the solar system was formed in a nebula from the condensation of a cloud of gas and suggests the existence of celestial objects, later called black holes

1801 : Discovery of the first known asteroid, Ceres, by Giuseppe Piazzi

1805 : Demonstration that the sun is in motion in the galaxy by William Herschell

1846 : First observation of Neptune by Johann Gotfried Galle and Heinrich d’Arrest





1858 : Invention of the photoheliograph which allows to photograph the sun by Warren de la Rue

1859 : Discovery of the different rotation speeds of the sun, at the poles and at the equator, by Christopher Carrington

1877 : Discovery of the 2 satellites of Mars, Deimos and Phobos

1892 : Discovery of the 5th satellite of Jupiter, Amalthea, by Edward Barnard

 




 

1898: Discovery of the 8th satellite of Saturn, Phoebe, by William Pickering




1915: Discovery of the first star closest to the Sun, Proxima Centauri by Robert Ines

1918: First estimate of the diameter of the Milky Way by Harlow Shapley

1922 : Theory of the birth of the Universe from a dense expanding core by Alexander Friedmann

Edwin Hubble is a gold medalist of the Royal Astronomical 


 
1929 : Confirmation that the Universe is expanding by Edwin Hubble
1930 : Big Bang theory by Georges Gamow

1930 : Discovery of Pluto by Clyde William Tombaugh

1948 : Discovery of the 5th moon of Uranus, Miranda, by Gerard Kuiper



1951 : Discovery of the spiral shape of the Milky Way by William Wilson Morgan

1990 : Commissioning of the Hubble telescope

2022 : Commissioning of the James Webb telescope to replace Hubble