oort cloud
/ˈɔːrt klaʊd/
Word Rarity
Very rare
Frequency: Zipf frequency 2.26 in modern English
12
Scrabble Score
9
Letters
2
Syllables
7
Unique Chars
Meaning
name
The Solar System's Oort cloud, extending from 50,000 to 100,000 astronomical units (approximately 1 light year) from the sun; supposedly the source of most comets around the Solar System.
noun
A roughly spherical region of space composed of comet-like bodies and other minor planets and asteroids that orbit distantly in a planetary system.
Etymology
Named after the Dutch astronomer Jan Hendrik Oort, who revived the Estonian astronomer Ernst Öpik’s idea from 1932 of a reservoir of long-period comets in the form of an orbiting cloud at the outermost edge of the Solar System in 1950 to resolve a paradox about the origin of comets.
Inflected Forms
the Oort Cloud (canonical)
Oort clouds (plural)