October 12, 1773 (, Kimi August 27), the French astronomer Charles Messier first discovered the spiral structure of galaxies.



Messier
13, 1773 10 French astronomer Charles Messier first discovered the spiral structure of the galaxy M51.
Messier (Messier.Charles, 1730.6.26 - 1817.4.12) French astronomer lead in developing the system of nebulae and star clusters table Messier Star Table.
Messier era, the nebula is a term used to represent any ambiguous light source of deep space. 1751, Messier in the famous French astronomer JN Dreier there the day Wen observations tracing Members and recorder. He is French first observed people expected in the 1758-1759 year return of Halley's Comet. Since then, Messier became an enthusiastic new comets search. King Louis XV of France had called him a "comet hunter. Messier independently discovered 13 comets and many other comet observations. In 1760, he began to be compiled Nebula table, in order to better distinguish nebulae and comets. He was small telescope, these two celestial bodies appears to be the same. Until now, many of the most famous of the nebula is still in use Number to call Messier nebulae and star clusters on the celestial table is the best object of modern astronomy enthusiasts test telescope. [L $ dj��.c��m]