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An Oort cloud is a spherical cloud around a star or other celestial body, composed of tiny ice particles, dust, and other debris, situated where the star's influences are counter-balanced by the aggregate of forces external to the star.

In 2370, to detect Maquis ships coming into the Bryma system to launch a possible attack on the Cardassian colony on Bryma, Chief O'Brien hid a dozen sensor probes in the Oort cloud of the star system, where the Maquis wouldn't be able to detect them. (DS9: "The Maquis, Part II")

The Oort cloud gets its name from Jan Hendrik Oort, a 20th century Earth astronomer who first postulated its existence in 1950.

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