# An Etymological Dictionary of Astronomy and AstrophysicsEnglish-French-Persian

## فرهنگ ریشه شناختی اخترشناسی-اخترفیزیک

### M. Heydari-Malayeri    -    Paris Observatory

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Number of Results: 25 Search : body
 secondary body   جسم ِ دومان   jesm-e dovomânFr.: corps secondaire   A body that revolves around a more massive body under the → gravitational attraction of the latter is called the → primary body. The less massive component in a → binary system.→ secondary; → body. small solar system body   جسم ِ کوچک ِ راژمان ِ خورشیدی   jesm-e kucak-e râžmân-e xoršidiFr.: petit corps du système solaire   A term introduced by the → International Astronomical Union (August 2006) to name the → solar system bodies other than → planets and → dwarf planets. Small solar system bodies include → asteroids, → comets, and → meteoroids.→ small; → solar; → system; → body. three-body problem   پراسه‌ی ِ سه‌جسم   parâse-ye sé jesmFr.: problème à trois corps   The mathematical problem of studying the positions and velocities of three mutually attracting bodies (such as the Sun, Earth and Moon) and the stability of their motion. This problem is surprisingly difficult to solve, even in the simple case, called → restricted three-body problem, where one of the masses is taken to be negligibly small so that the problem simplifies to finding the behavior of the mass-less body in the combined gravitational field of the other two. See also → two-body problem, → n-body problem.→ three; → body; → problem. two-body problem   پراسه‌ی ِ دو جسم   parâse-ye do jesmFr.: problème à deux corps   In classical mechanics, the study concerned with the dynamics of an isolated system of two particles subject only to the Newtonian gravitational force between them. The problem can be separated into two single-particle problems with the following solutions. The equation of the → center of mass is governed by the equation of the same form as that for a single particle. Moreover, the motion of either particle, with respect to the other as origin, is the same as the motion with respect to a fixed origin of a single particle of → reduced mass acted on by the same internal force. See also → three-body problem, → n-body problem.→ two; → body; → problem. two-body system   راژمان ِ دو جسم   râžmân-e do jesmFr.: système à deux corps   A → dynamical system consisting of two masses that interact via → central forces.→ two; → body; → system.

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