tidal radius

tidal radius

[′tīd·əl ′rād·ē·əs]
(astronomy)
The distance from the center of a planet in formation at which the planet's gravitational attraction for nearby gas equals that of the Sun.
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References in periodicals archive ?
The concentration of stars then gradually declines out to an invisible boundary called the cluster's tidal radius.
The contraction makes what is knwon as an infall zone between the tidal radius and the actual surface of the planet.
Jupiter pulls in gas so fast that it can't quite fill its tidal radius.