. . . "Oort cloud"@en-us . "0"^^ . . "107770893"@en-us . . "0"^^ . . "(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"@en-us . . . "08270662-n"^^ . . "106140900"@en-us . "Oort cloud"^^ . "108270662"^^ . .