An Etymological Dictionary of Astronomy and Astrophysics
English-French-Persian

Light exhibiting → linear polarization.

→ linearly; → polarized; → light.

Same as → LINER.

→ low; → ionization; → nuclear; → emission; → line; → region.

A year based solely on the Moon's motion, containing 12 synodic months, each of 29.5306 days, that is a year of 354.3672 days. Used by Hebrews, Babylonians, Greeks, and Arabs.

→ lunar; → year.

Close; to a point or place not far away.

O.E. near "closer, nearer," comparative of neah, neh "nigh."

Nazdik, from Mid.Pers. nazdik "near," from nazd "close" (Mid.Pers. nazd, nazdik "near," nazdist "first;" O.Pers. ašna- "close;" Av. nazdišta- "nearest, next," nazdyo "nearer to," nas- "to come near, approach, reach;" cf. Skt. nédīyas- "closer, very close," nas- "to approach, to reach") + -ik, → -ic.

The longest wavelengths of the ultraviolet region, which are adjacent to the visible, from 200 to 350 nm.

→ near; → ultraviolet.

An → asteroid whose orbit lies partly between 0.983 and 1.3 → astronomical units from the Sun, so that it passes close to the Earth. Currently thousands of near-Earth asteroids are known, ranging in size up to about 30 km. Among them, there are between 500 and 1,000 such asteroids larger than one km in diameter. They are divided into three subclasses: → Amor asteroids, → Apollo asteroids, and → Aten asteroids. See also → near-Earth object.

→ near; → earth; → asteroid.

An → asteroid, → comet, or large → meteoroid whose orbit brings it exceptionally close to the Earth, and which may therefore pose a collision danger. Most such objects are in orbits around the Sun with → perihelion distance less than 1.3 → astronomical units. See also → near-Earth asteroid.

→ near; → earth; → object.

That region of the → electromagnetic spectrum covering shorter infrared wavelengths. It contains the → infrared windows between about 0.8 and 8 → microns, but the longer wavelength limit is not well defined. See also: → infrared radiation, → mid-infrared, → far-infrared, → submillimeter radiation.

→ near; → infrared.

A → linear differential equation if Q(x)≠ 0 on interval I.

→ nonhomogeneous; → linear; → differential; → equation.

Not a linear function of the relevant variables.
Containing a variable with an exponent other than one; opposite of → linear.

→ non-; → linear.

An electronic device whose output is not directly proportional to its input. For example, in a → diode the current is a nonlinear function of the voltage; its voltage-current characteristics do not obey → Ohm's law.

→ nonlinear; → device.

Same as → chaos.

→ nonlinear; → dynamics.

The instability of a physical or mathematical system that arises from the nonlinear nature of relevant variables and their interactions within the system.

→ nonlinear; → instability.

A system in which small changes can result in large effects, and large changes in small effects.

→ nonlinear; → system.

The property, condition, or state of being → nonlinear.

→ non-; → linearity.

Of or pertaining to a → nucleus.

From nucle(us), → nucleus, + -ar variant of the adjective-forming suffix → -al.

Haste-yi, from hasté, → nucleus, + -i adjective-forming suffix.

The region of high potential energy through which a charged particle must pass on entering or leaving an atomic nucleus. → Gamow barrier.

→ nuclear; → barrier.

A → nuclear reaction inside a star that produces the energy to make the star shine and also transform chemical elements into others.

→ nuclear; → burning.

The positive electric charge on the nucleus of an atom.

→ nuclear; → charge.

→ nuclear burning.

→ nuclear; → combustion.