A primary mirror (or primary) is the principal light-gathering surface of a reflective telescope.
The Primary Chronicle (; , Povest' vremennykh let; , Povist' vrem'anykh lit; Apovests' minulikh chasou often translated into English as Tale of Bygone Years), or Russian Primary Chronicle, is a history of Kievan Rus'
Kievan Rus' ...
The primary mirror of the telescope measures 2.4 m (8 ft) in diameter and weighs about 826 kg (1820 lbs). It is constructed of ultra-low expansion silica glass and coated with a thin layer of pure aluminum to reflect visible light.
Primary mirror cell and box
Square stainless steel tubing and aluminum plate was obtained from local Metal Supermarket. After steel parts were cut, the frame was welded at the local shop near Harrowsmith.
Primary mission of testing. Completing a successful primary mission, the probe tested twelve advanced technologies in space.
Primary Wave: A longitudinal seismic acoustic wave that moves by compression. The p-waves travel faster than s-waves and can penetrate the core of the Earth. [H76]
Packing Fraction ...
primary atmosphere The chemical components that would have surrounded Earth just after it formed.
prime focus The point in a reflecting telescope where the mirror focuses incoming light to a point.
primary lens
a telescope's main lens which gathers light and brings it to a focus
primary mirror ...
Primary Colors
The primary colors are the basis for the color wheel. The whole point of the wheel is that all the other colors on the wheel are made up of varying amounts of just those three colors.
Primary anisotropy
The anisotropy of the cosmic microwave background is divided into two sorts: primary anisotropy - which is due to effects which occur at the last scattering surface and before - and secondary anisotropy - which is due to ...
Primary body The body that is being orbited. E.g. the Sun is the primary of the orbits of the planets and comets. With respect to multiple star systems, it is the most massive star.
primary ~: any ~ on the planes of the horizon, the meridian or the prime vertical. Usually, this is extended to include those on the equatorial (equinoctial) and polar planes.
Primary Minimum
In the light curve of an eclipsing binary, the deeper eclipse.
Prime Focus ...
Primary. A term used to describe the larger or brighter member of a pair of celestial objects.
primary lens, mirror: The main optical element in an astronomical telescope. The large lens at the top of the telescope tube or the large mirror at the bottom.
Primary Distance Indicator - A type of object, such a Cepheid variable, for which we know the size or brightness by observing them in the Milky Way ...
Edit Primary Contributor
The 24th Century Technical Manual-Reference books
American Cinematographer-Behind-the-scenes magazine
Bajoran assault vessel-Studio model
Bajoran interceptor-Studio model
Bajoran raider-Studio model ...
[edit] Primary sources, available in English
Berdan, Frances F. and Patricia Reiff Anawalt (1997) The Essential Codex Mendoza. University of California Press, Berkeley. ISBN 0-520-20454-9.
Cortés, Hernan (1987) Letters from Mexico. New Ed.
Primary among the mission's scientific goals is to search for and characterize a wide range of rocks and soils that hold clues to past water activity on Mars.
Primary scientific results from HIPASS to date include the imaging of the Magellanic Stream to allow the determination of its formation, and a measurement of the HI mass density in the local Universe.
Primary and Secondary Ground Stations, funded by several organizations, contribute to HETE-2's strength by transferring HETE-2 data and notifying observatories around the world and in space about active bursts.
Primary Mirror
A large mirror in a reflecting telescope that captures light from celestial objects and focuses it toward a smaller secondary mirror. The primary mirror in the Hubble Space Telescope measures 94.5 inches (2.4 meters) in diameter.
PRIMARY
A primary is a planetary body around which a moon or satellite orbits.
primary cosmic rays - (n.)
The cosmic rays arriving at the top of the earth's atmosphere.
primary mirror - (n.) ...
"A primary goal of the next flagship mission to the Jupiter system will be to characterise, in detail, the geophysical, compositional, geological, and external processes that affect icy satellites," he says.
-- Primary Middle Secondary Post Secondary
Please check all that apply:
Astronomy basics (moon phases, seasons, solar system, seasonal constellations, etc.) ...
The primary mirror is located at the lower end of the telescope tube in a reflector and has its front surface coated with an extremely thin film of metal, such as aluminum.
The primary source of infrared radiation is heat or thermal radiation. This is the radiation produced by the motion of atoms and molecules in an object.
The primary standard candle in astronomy is the Cepheid variable, a star with a luminosity that is set by its pulsation period.
The primary rainbow is caused by a single reflection from raindrops. It will be highest at 42° above the shadow of your head. The secondary rainbow has the colors reversed and is caused by a double reflection from raindrops.
The primary objective was to demonstrate the feasibility of low-cost landings on and exploration of the Martian surface.
The primary objective of MARSIS is to map the distribution of water and ice in the upper layers of the Martian crust.
The primary is now believed to be a yellow-orange main sequence dwarf star of spectral and luminosity type G5 Vb, although it was once classed as yellow as G2 (ten Brummelaar et al, 2000).
The primary concern of the Observatory had always been the production of accurate tables of star positions for navigators.
The primary, Algol A, is a blue B8V main sequence star. This spectral type implies that an effective temperature of 12000 K, a diameter 3 times that of the sun, ...
The primary mirror for Gemini North. Note the person in the center. The 8.1m primary is only 20 cm thick. Image: Gemini Observatory.
The primary purpose of these GONG velocity images is to provide data for analyzing the oscillations of the sun. For studies of the nearly steady flows the oscillatory signal represents a source of noise and needs to be removed from the data.
The primary difference between the two formulations is that the second form uses the difference in position to construct a vector that points from one mass to the other, ...
The primary circle defined by the central plane of the Galaxy. [H76]
Galactic Halo ...
The primary is a fairly bright 5.0; the companion has a visual magnitude of 6.1 and is found at PA 55º and separation 26.6".
The primary function of these "medicine men" (who are not always male) is to secure the help of the spirit world, including the Great Spirit (Wakan Tanka in the language of the Lakota Sioux), for the benefit of the community.
The primary reason I still use a paper logbook is that when I am at the eyepiece, it is much easier to write what I see on paper, rather than into a computer. Besides, you can only draw a deep sky object on paper! ...
Have primary care sports medicine fellowships influenced family medicine match rates? Internet Journal of Family Practice, 2008
Brief Psychosis Associated With Triple Therapy For Peptic Ulcer. Internet Journal of Family Practice, 2006 ...
Is the primary function of a telescope really to make things look bigger? Take this test. Step outside on a clear night from a brightly lit room. See anything? Probably not. But it gets better after a few minutes, doesn't it?
Webb's primary mirror is 60 times larger than Spitzer's mirror and seven times larger than Hubble's.
Both the primary and secondary bodies in a pair can be affected by land tides caused by its partner. Long ago, when the Moon used to have a more rapid rotation, it experienced land tides caused by the gravitational pull of the Earth.
Note that the primary source of SPICE data is NAIF's anonymous FTP site. See, in particular: ...
There are two primary types of terrain on the Moon: the heavily cratered and very old highlands and the relatively smooth and younger maria.
Venus was also the primary planetary target of the Soviet planetary exploration program during the 1960s, '70s, and '80s, in which several spectacular successes were achieved.
neutron capture The primary mechanism by which very massive nuclei are formed in the violent aftermath of a supernova. Instead of fusion of like nuclei, heavy elements are created by the addition of more and more neutrons to existing nuclei.
parallel A circle on the surface of the earth, parallel to the plane of the equator and connecting all points of equal latitude, or a circle parallel to the primary great circle of a sphere or spheroid; ...
Cassegrain telescope (NASA SP-7, 1965) A reflecting telescope in which a small hyperboloidal mirror reflects the convergent beam from the paraboloidal primary mirror through a hole in the primary mirror to an eyepiece in back of the primary ...
In between the primary eclipses is a secondary eclipse a third the depth of the primary. Eclipsers reveal their secrets quickly through analysis of the variation in light and in the variation of the velocities of the orbiting stars.
Its primary mission is to analyze the surface features, in particular to try to determine the chemical composition of the soil and rocks and obtain information about radiation and climate as well.
A type of magnetic cataclysmic binary that consists of a closely-orbiting dwarf M star or K star and a super-strong magnetic white dwarf primary, ...
The more massive star (A) of a binary is called the primary, and the less massive (B) is called the secondary; e.g., Sirius A and Sirius B are the primary and secondary components of the Sirius system.
between higher and middle latitudes, a primary consideration is that aurora is seldom seen until the sun is some degrees below the horizon.
Of primary importance in studying the structure of the Milky Way is a knowledge of star distances. The parallax method of determining these distances can be applied only to a few thousand of the nearest stars.
Light enters through the corrector plate where it strikes the primary mirror in the back of the tube. It is then reflected to a small secondary mirror attached to the front corrector plate.
The primary boundary established is that science strictly deals with the material universe.
 See also: Time, Second, Light, Earth, Period
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