Primary

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 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 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 auroral particles have energies between few tens eV and few hundred keV, being higher on the nightside than on dayside.

Primary of the Guardian of Forever planet (unnamed planets) [edit] Borg star A star in Borg territory ...

PRIMARY MISSION EXTENDED MISSION Phase A: Preliminary Analysis The Project creates a preliminary design and project plan as a proof of concept specifying what to build, when to launch, the course the spacecraft is to take, ...

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. Packing Fraction ...

Primary mirror diameter: 6.5 m Mass: 11,000 lbs Cost: $824.8 million Orbit: 1.5 million km, at the L2 Point Operating temperature: <50K ...

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 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 effects, ...

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.) ...

Primary education in Taiwan continues to teach pronunciation using zhuyin annotation.

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 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 ...

primary atmosphere The chemical components that would have formed Earth's atmosphere. primary lens ...

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 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, 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 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 question that SDSS was designed to answer is: what is the large-scale structure of the universe? Scientists know that stars make up galaxies, galaxies make up clusters, and clusters make up superclusters.

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! ...

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?

A: is the primary fuel of stars (it releases energy in a nuclear process called ). Q: How can schientists find out what gases are in stars or nebulae? from Natsumi Y., Valencia, CA, USA; November 25, 2001 ...

One of the primary goals of this service is to make it easy to use, but of course a limited insight into astronomy is required. You should be able to understand the workings of the service by trial and (hopefully not) error.

There are two primary types of terrain on the Moon: the heavily cratered and very old highlands and the relatively smooth and younger maria.

The leaf is the primary site of photosynthesis in plants. Click on image for full size version (153K JPEG) Image has been released into public domain (found on wikipedia.org).

radian: [rad] the primary unit of angular measurement, it is the central angle subtended by an arc of a circle equal in length to its radius. 2 radians = 360ºor 1 rad 57.3º. ray: a single line or narrow beam of light.

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.

COBE carried three primary instruments that could detect any electromagnetic radiation with wavelengths between 1 and 10,000 microns (1 micron="1 millionth" of 1 m).

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 mirror.

Cassegrain focus A focal point that lies behind the primary mirror of a reflecting telescope. In order to achieve this focus, a reflecting telescope must have a secondary mirror and a hole cut in the center of the primary mirror.

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.

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.

The distribution, of course, turns out to be broader than once thought (see the Sandage and Bedke atlas), so this is not such a good primary indicator.

as follows: Greg Goebel (full name Gregory Vaughn Goebel) Known as "Mister G", though I do answer to Greg Born 1953 in Spokane, state of Washington (NOT Washington DC), NW USA Now living in Loveland, Colorado, north of Denver Twelve years primary ...

L1, L2, and L3 lie along the centerline between the centers of mass between the two masses; L1 is on the inward side of the secondary, L2 is on the outward side of the secondary; and L3 is on the outward side of the primary.

The primary star is a red giant of 4.36 mag. Its campanion of 8.1 mag is hard to observe because of the glow of the primary. Smaller scopes may fail to resolve this pair.

We usually think of the Jupiter's primary elements, hydrogen and helium, as gases. However, at a depth of a few thousand kilometers below the surface, these elements turn to liquid. Most of the planet's mass is in fact in a liquid state.

The a here is the average distance from the primary body. If we are talking about the Earth and the Sun, the primary body is the Sun. P is the sidereal period of revolution. In the case of the Earth, this is one year.

A small mirror in a reflecting telescope that redirects light from the larger primary mirror toward the light-sensitive scientific instruments.

Definition: synchronous rotation: Said of a satellite if the period of its rotation about its axis is the same as the period of its orbit around its primary. This implies that the satellite always keeps the same hemisphere facing its primary (e.g.

The Census becomes a primary source of information for people trying to understand the nation.

See also: Time, Light, Second, Earth, Period