Oort cloudOort cloud
a spherical, moving mass of icy cosmic debris thought to exist in the vast region beyond Pluto and to be the source of the long-period comets that orbit the sun
Origin of Oort cloudafter J. Oort (1900-92), Dutch astronomer
A swarm of comets orbiting the sun at a distance of one to two light years, proposed as a source of comets that pass near the sun.
Origin of Oort cloudAfter Jan Hendrix Oort (1900-1992), Dutch astronomer
Named after Dutch astronomer Jan Hendrik Oort.