By Ian Ridpath

ISBN-10: 0192115960

ISBN-13: 9780192115966

Astronomy is increasing nearly as quickly because the universe itself, and the proliferating medical jargon can occasionally baffle even the main committed beginner. Now, in a few 4,000 concise, up to date entries, this dictionary cuts a transparent direction during the maze of advanced technical language, providing complete, transparent definitions drawn from all facets of astronomy. Compiled by way of Ian Ridpath, a fellow of the Royal Astronomical Society, and a professional group of individuals, A Dictionary of Astronomy includes the newest entries from astrophysics and cosmology to galaxies and time.
listed below are succinct definitions for the massive Bang idea, comets, eclipses, Magellanic Clouds, Mars, quasar, relativity, and variable stars. Entries on telescopes and different measuring units, observatories, area missions, and lately named sunlight procedure items exhibit how astronomers have explored the universe. The Dictionary additionally presents biographical entries on eminent astronomers from Copernicus to Edwin Hubble.
From black gap to white dwarf, and from spiral galaxies to sunlight waves, A Dictionary of Astronomy opens a window at the universe for newbie astronomers in every single place.

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Extra info for A Dictionary of Astronomy

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The type star also exhibits X-ray variability. Amor group A group of asteroids that cross the orbit of Mars, but not that of Earth; also known as Earth-approaching (or Earth-grazing) asteroids. 3 AU (the perihelion of Mars). Close approaches to Mars and Earth can turn Amors into Earth-crossers (see APOLLO GROUP) temporarily, and vice versa (see also NEAR-EARTH ASTEROID). The group is named after (1221) Amor, diameter 1 km, discovered in 1932 by the Belgian astronomer Eugène Joseph Delporte (1882–1955).

Away. annealing In optical manufacture, the process of allowing glass or ceramic to cool slowly at a controlled rate, to avoid stress patterns within the material. html (2 of 2) [9/29/2007 7:47:14 PM] Document Page 18 A large mirror blank, for example, is cast from molten material. If cooling is too rapid, temperature variations will arise and some areas will solidify more rapidly than others, creating internal stresses that can cause the mirror blank to shatter when it is being ground to shape.

It uses an array of telescopes to simulate a single telescope of large aperture (see the diagram on p. 22). In principle, an aperture of any size can be synthesized by moving the two elements of an *interferometer to occupy all possible positions in the desired aperture. In practice, all synthesis telescopes make use of the fact that over a period of 12 hours the Earth's rotation will move the elements to sweep out half a ring of the synthesized aperture (supersynthesis, or Earth-rotation synthesis); the other half of the ring can be derived from the observations of the first half.

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A Dictionary of Astronomy by Ian Ridpath


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