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
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.