| 单词 | gravitational instability |
| 释义 | gravitational instabilitygravitational instabilityThe tendency for fluctuations in an inhomogeneous medium to grow because of self-gravitation. It is opposed by pressure forces. The critical length-scale beyond which such condensations collapse is known as a Jeans length, and the Jeans mass it encloses eventually forms a stable gravitationally bound system. The Jeans length is thus often taken as a characteristic length-scale for gravitational collapse; an interstellar cloud larger than the Jeans length will fragment into clumps with this characteristic size. See also galaxies, formation and evolution.gravitational instability[‚grav·ə′tā·shən·əl ‚in·stə′bil·əd·ē] |
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