Share this credible answer with others. Simply paste this code into your blog or Web page:
He proposed (1951) the existence of a disk-shaped region of minor planets outside the orbit of Neptune (now called the Kuiper belt) as a source for short-period comets Ñthose making complete orbits around the sun in less than 200 years (see also Oort, Jan Hendrik).
|
Answer verified with
|
HighBeam gives you access to newspaper, magazine, and trade journal articles plus press releases, facts, information, and biographies from thousands of sources.