Download e-book for iPad: A Dictionary of Astronomy (Oxford Paperback Reference) by Ian Ridpath

By Ian Ridpath

ISBN-10: 0192115960

ISBN-13: 9780192115966

Astronomy is increasing virtually as swiftly because the universe itself, and the proliferating medical jargon can occasionally baffle even the main devoted beginner. Now, in a few 4,000 concise, up to date entries, this dictionary cuts a transparent direction throughout the maze of advanced technical language, supplying complete, transparent definitions drawn from all points of astronomy. Compiled via Ian Ridpath, a fellow of the Royal Astronomical Society, and a professional staff of individuals, A Dictionary of Astronomy comprises the latest entries from astrophysics and cosmology to galaxies and time.

Here are succinct definitions for the large Bang conception, comets, eclipses, Magellanic Clouds, Mars, quasar, relativity, and variable stars. Entries on telescopes and different measuring units, observatories, house missions, and lately named sun approach gadgets exhibit how astronomers have explored the universe. The Dictionary additionally offers 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 in all places.

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Astronomy is increasing nearly as quickly because the universe itself, and the proliferating clinical jargon can occasionally baffle even the main committed novice. Now, in a few 4,000 concise, updated entries, this dictionary cuts a transparent course during the maze of advanced technical language, supplying complete, transparent definitions drawn from all features of astronomy.

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Extra resources for A Dictionary of Astronomy (Oxford Paperback Reference)

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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). 9. Amor group members show a broad variety of compositional types, evidently having originated from several sources. Asteroids may be perturbed into Amor-type orbits either by Jupiter, from near 3 : 1 and 5 : 2 Kirkwood gaps in the main *asteroid belt, or by Mars, from near the inner edge of the main belt.

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.

The tails are probably composed of stars pulled out by gravitational tidal interactions during the collision of a spiral and a lenticular galaxy. antenna pattern A graph of the sensitivity or gain of a radio telescope in various directions. A typical antenna pattern shows several sensitivity maxima (lobes) of which the strongest (the main lobe or main beam) defines the direction in which the telescope is most sensitive. An antenna pattern with a narrow main lobe of circular cross-section and negligible *side lobes is known as a pencil beam, while a pattern with a wide, flat main lobe is known as fan beam.

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