FTP, name this Dutch astronomer, best known for his namesake cloud.
He created several laws of galactic rotation, and proposed that the sun was on the edge of the Milky Way galaxy. An early advocate of dark matter, he also argued that the Crab Nebula resulted from a supernova explosion, but he is most famous for his discovery of comet dust outside of Pluto's orbit. FTP, name this Dutch astronomer, best known for his namesake cloud.
He created several laws of galactic rotation, and proposed that the sun was on the edge of the Milky Way galaxy.
Jan Hendrik {Oort}