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

A natural deposit containing a mineral of an element to be extracted.

Ore, merger of M.E. ore, O.E. ora "ore, unworked metal" and M.E. or(e) "ore, metal," O.E. ar "brass, copper, bronze" (cf. O.N. eir "brass, copper;" Ger. ehern "brazen;" Erz "oar;" Goth. aiz "bronze;" O.H.G. ēr "ore"), from PIE *aus- "gold;" cf. Mod/Mid..Pers. âhan "iron;" Av. aiianhaēna- "made of metal," from aiiah- "metal;" Skt. áyas- "iron, metal;" L. aes "brass"

Kâné, from kân "mine," from kandan "to dig" (Mid.Pers. kandan "to dig;" O.Pers. kan- "to dig," akaniya- "it was dug;" Av. kan- "to dig," uskən- "to dig out" (→ ex- for prefix us-); cf. Skt. khan- "to dig," khanati "he digs").

A controversial proposition according to which a coincidence would exist between the mutual positions of the three stars of → Orion's Belt and those of the main Giza pyramids. More specifically, Khufu, Khafre, and Menkaure would be the monumental representation of → Alnitak, → Alnilam, and → Mintaka, respectively.

→ Orion; → correlation; → theory.

A mechanical device that illustrates the relative positions and motions of the planets and moons in the solar system in heliocentric model.

Named after Charles Boyle, 4th Earl of Orrery (1676-1731), for whom the device was first made.

A quantum-mechanical measure of the probability that a specific atomic transition will occur. It is used in the equation for the absorption coefficient of a spectral line. Also known as f value.

→ oscillator; → strength.

For a curve C at a point p, the limiting sphere obtained by taking the sphere that passes through p and three other points on C and then letting these three points approach p independently along C.

→ osculating; → sphere.

A → spacecraft whose goal is to collect a sample from the asteroid → 101955 Bennu and bring it back to Earth. It was launched by → NASA on September 8, 2016. OSIRIS-REx will spend two years chasing Bennu down, finally rendezvousing with the → near-Earth asteroid in August 2018. The spacecraft will then study the → asteroid Bennu from orbit for another two years before grabbing at least 60 grams of surface material in July 2020. The sample should reach Earth in 2023. The analysis of the sample would allow to study the role that → B-type asteroids like Bennu, which are primitive and apparently carbon-rich, may have played in helping life appear on Earth.

The name is short for Origins, Spectral Interpretation, Resource Identification, Security, Regolith Explorer .

The hydrostatic pressure produced on the surface of a partially permeable membrane by osmosis.

→ osmotic; → pressure.

The upper zone of the → Earth's core, just below the → mantle, extending from a depth of about 2900 km to 5100 km. It is presumed to be → liquid because it sharply reduces → compressional wave velocities and does not transmit → shear waves. Its density is from 9 to 11 g/cm³. The → temperature ranges from 4400 °C in the outer areas to 6100 °C near the → inner core. Since shear waves do not propagate through a fluid, the Earth's outer core is considered to be liquid because the shear wave velocity is zero. Convection motion within the outer core, along with the rotation of the Earth creates an effect that maintains the Earth's → magnetic field.

→ outer; → core.

A → Lindblad resonance expressed by: Ω_p = Ω + κ/m.

→ outer; → Lindblad resonance.

The act of extending research activities beyond its current or conventional limits to a wide section of the population for educational purposes.

→ out; reach, M.E. rechen, O.E. ræcan "to extend, hold forth;" cf. O.Fris. reka, M.Du. reiken; cognate with Pers. râst, → right.

Borun-rasâni, from borun, → out, + rasâni verbal noun of rasândan "to carry, guide, send," transitive of rasidan "to reach, arrive," → access.
Hame-âmuzi, literally "teaching every body," from hamé, → all; âmuzi, from âmuxtan "to teach; learn," → teach.

Excessive exposure of a detector, → over-expose.

→ over-; → exposure.

1) To estimate at too high a value, amount, rate, or the like.
2) An estimate that is too high.

→ over-; → estimate.

The → moment of inertia of a body about any given axis is the moment of inertia about a parallel axis through the center of mass, plus the moment of inertia about the given axis if the mass were located at the center of mass. same as → Steiner's theorem.

→ parallel; → axis; → theorem.

A catalog of stars in the → Orion Nebula created by P. P. Parenago in 1954 (Publ. Astr. Inst. Sternberg, Band 25, p. 393-437, Moskau).

Pavel Petrovich Parenago (1906-1960), a Soviet astronomer.

1) General: A father or a mother. A precursor, or → progenitor.
2) Physics: A → nuclide that upon → radioactive decay or → disintegration yields a specific nuclide (the → daughter). See also → parent cloud, → parent element, → parent galaxy, → parent molecule.

From O.Fr. parent, from L. parentem (nominative parens) "father or mother, ancestor," from parere "to bring forth, give birth to, produce," from PIE base *per- "to bring forth"

Permâr, literally "father-mother" (as in Sogd. māt-pitri "parent"), from Gilaki per, → father, + Gilaki mâr, → mother.

Usually of a newborn star, the molecular cloud in which the star has formed.

→ parent; → cloud.

A radioactive element that spontaneously decays into a new substance. The product of this decay is known as a "daughter" element.

→ parent; → element.

Of a high redshift supernova, the galaxy in which the event has occurred.

→ parent; → galaxy.

The molecule initially produced when a comet nucleus sublimates, soon changed to different daughter molecules because of solar radiation.

→ parent; → molecule.

A catalog of 397 radio sources between declinations +20° and +27° which were compiled from a finding survey made at 635 MHz with the 64m radio telescope at the Australian National Radio Astronomy Observatory, Parkes, N.S.W. and published in 1968. Originally abbreviated PSR, this catalog, which is also called PKS, replaces and improves on four earlier lists (1964 to 1966).

Parkes, proper noun; selected, p.p. of → select; → region.