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Oort cloud (n.)

in reference to a 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.

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Definitions of Oort cloud

Oort cloud (n.)
(astronomy) a hypothetical huge collection of comets orbiting the sun far beyond the orbit of Pluto; perturbations (as by other stars) can upset a comet's orbit and may send it tumbling toward the sun;
From wordnet.princeton.edu

Dictionary entries near Oort cloud

oolong

oom-pah

oomph

-oon

oops

Oort cloud

ooze

oozy

op-

*op-

op. cit.