An Etymological Dictionary of Astronomy and Astrophysics

3 terms — N › N

N NA NE NG NI NO NU NY

n-body problem   پراسه‌ی ِ n جسم   parâse-ye n-jesm Fr.: problème de n-corps The mathematical problem of studying the behavior (e.g., velocities, positions) of any number of objects moving under their mutual gravitational attraction for any time in the past or future. Same as the → many-body problem. See also: → body; → problem.

n-type conductivity   هازندگی ِ گونه‌ی ِ n   hâzandegi-ye gune-ye n Fr.: conductivité de type n The conductivity in a semiconductor caused by a flow of electrons, whereas p-type conductivity is caused by a flow of holes. See also: n standing for → negative; → type; → conductivity.

N66 N66 Fr.: N66 The largest and the most luminous → H II region in the → Small Magellanic Cloud, which contains the prominent OB star cluster → NGC 346. N66 has a diameter of about 7 arcmin on the sky corresponding to about 120 pc for a distance of about 60 kpc. Compared with the → Orion Nebula, N66 has an Hα luminosity almost 60 times higher. See also: Serial number in the Henize (1956) catalog, more precisely designated as LHA 115-N66.