follow Dictionary.com

How do you spell Hannukah?

Oort cloud

[awrt, ohrt] /ɔrt, oʊrt/
noun, Astronomy
1.
a region of the solar system far beyond the orbit of the dwarf planet Pluto in which billions of comets move in nearly circular orbits unless one is pulled into a highly eccentric elliptical orbit by a passing star.
Compare Kuiper belt.
Origin
1975-1980
1975-80; after Dutch astronomer Jan Hendrik Oort (1900-1992), who proposed its existence
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
Cite This Source
Word Origin and History for Oort cloud
n.

in reference to the hypothetical cloud of small objects beyond Pluto that become comets, proposed 1949 by Dutch astronomer Jan Hendrick Oort (1900-1992), and named for him by 1968.

Online Etymology Dictionary, © 2010 Douglas Harper
Cite This Source
Oort cloud in Science
Oort cloud
  (ôrt)   
A sphere-shaped mass of more than 100 billion comets that makes up the outer edge of the solar system, surrounding the Kuiper belt and the planets. Some comets from this area are drawn into the inner solar system by passing stars and other forces and take more than 200 years to make one complete orbit of the Sun. Compare Kuiper belt.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
Cite This Source

Word of the Day

Difficulty index for Oort cloud

Few English speakers likely know this word

Word Value for Oort

0
0
Scrabble Words With Friends

Nearby words for oort cloud