In 1927, he confirmed that the Milky Way orbits in its own plane around the center of the galaxy.
In 1927, he confirmed that the Milky Way orbits in its own plane around the center of the galaxy. He also noticed that there is a strong tendency for aphelia of long period comets to lie at a distance of about 50,000 astronomical units, and by combining this with the observed isotropy of space, he deduced that comets must reside outside the solar system. For 10 points, name this Dutch scientist, for whom this comet cloud takes its name.
In 1927, he confirmed that the Milky Way orbits in its own plane around the center of the galaxy.
Jan {Oort}