ALL meanings of oort cloud
Oort cloud
O o - noun oort cloud 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. 1
- noun oort cloud a mass of comets orbiting the sun far beyond the orbit of Pluto, whose existence was first proposed by Jan Hendrick Oort (1900–92) in 1950 0
- noun oort cloud a moving mass of icy cosmic debris thought to exist in the vast region beyond Pluto and to be the source of the comets that orbit the sun 0