Messier 99 [SEP] discoverer or inventor
Messier 99
Messier 99 or M99, also known as NGC 4254, is a grand design spiral galaxy in the northern constellation Coma Berenices approximately in distance from the Milky Way. It was discovered by Pierre Méchain on March 17, 1781. The discovery was then reported to Charles Messier, who included the object in the Messier Catalogue of comet-like objects. Messier 99 was one of the first galaxies in which a spiral pattern was seen. This pattern was first identified by Lord Rosse in the spring of 1846.
his work in celestial mechanics.
- Paul-Émile Lecoq de Boisbaudran, chemist, discoverer of gallium, samarium and dysprosium.
- Jacques-Arsène d'Arsonval, physician, physicist, and inventor of the moving-coil D'Arsonval galvanometer and the thermocouple ammeter.
- Auguste Charlois, astronomer, who discovered around 99 asteroids.
- Jean Gaston Darboux, mathematician, he made several important contributions to geometry and mathematical analysis.
- Arthur Fallot, physician, who described in detail the four anatomical characteristics of the tetralogy