Download A Dictionary of Astronomy by Ian Ridpath PDF

By Ian Ridpath

Astronomy is increasing virtually as speedily because the universe itself, and the proliferating medical jargon can occasionally baffle even the main devoted novice. Now, in a few 4,000 concise, updated entries, this dictionary cuts a transparent direction throughout the maze of advanced technical language, supplying complete, transparent definitions drawn from all elements of astronomy. Compiled by means of Ian Ridpath, a fellow of the Royal Astronomical Society, and knowledgeable staff of members, A Dictionary of Astronomy includes the latest 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 sun method gadgets express 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 sun waves, A Dictionary of Astronomy opens a window at the universe for beginner astronomers far and wide.

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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.

Mass transfer via an accretion disk does occur in the W Serpentis stars, which have wider separations and may be pre-Algol stars. The terms W Serpentis star and Serpentid are sometimes used to include both groups of stars. 7-m antenna originally opened in 1966. It was operated by the National Research Council of Canada under the name Algonquin Radio Observatory until 1986. Since 1989 the site has been operated under its present name jointly by the Institute for Space and Terrestrial Science at York University, Toronto, and the Geodetic Survey Division of the Canada Center for Surveying and Mapping, Ottawa.

862 years. The system is a faint X-ray source and also emits radio bursts. y. away. html (1 of 2) [9/29/2007 7:47:09 PM] Document Algol star A type of eclipsing binary with periods of constant (or almost constant) brightness between well-defined eclipses; abbr. EA. This feature is an indication that the system is a *detached binary or *semidetached binary. The secondary minimum may be invisible. 2 to 10 000 days, and the amplitudes may reach several magnitudes. html (2 of 2) [9/29/2007 7:47:09 PM] Document Page 11 material is accreted directly on to the hot star, not via an *accretion disk.

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