By Ian Ridpath
Astronomy is increasing virtually as quickly because the universe itself, and the proliferating medical 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 complicated technical language, delivering complete, transparent definitions drawn from all facets of astronomy. Compiled through Ian Ridpath, a fellow of the Royal Astronomical Society, and a professional group of members, A Dictionary of Astronomy includes the newest entries from astrophysics and cosmology to galaxies and time.
listed below 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 sunlight 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 sunlight waves, A Dictionary of Astronomy opens a window at the universe for newbie astronomers far and wide.
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Extra info for A Dictionary of Astronomy
With no air molecules to collide with, the aluminium atoms travel directly to the mirror, coating it with a thin, even layer (about 100 nm thick). Subsequent layers of other materials, such as silicon dioxide, may then be deposited in a similar way to protect the coating. Large telescopes have aluminizing chambers housed within the observatory building so that the mirror can be re-aluminized on site whenever necessary. The reflectivity of a fresh aluminium coating with overcoating is 89%, declining by a few per cent a year as a result of oxidation of the surface.
There are several possible causes, including perturbations by other bodies; mass transfer between stars in a binary system; the elliptical shape of stars in a close binary; and the curvature of space around a massive body. apsides The two points in an elliptical orbit that lie closest to or farthest from the centre of the body being orbited; sing. apsis or apse. The closest point is the periapsis (or periapse) and the farthest point the apoapsis (or apoapse). The straight line joining these two points is the line of apsides, and is the same as the major axis of the orbit.
For *Astrophysical Journal. aplanatic Describing a lens or optical system that is free from both *spherical aberration and coma (see COMA, OPTICAL). Examples of aplanatic systems include some types of achromatic lens and the *Ritchey-Chrétien telescope. apoapsis The point in an elliptical orbit that lies farthest from the centre of the object being orbited. html (1 of 2) [9/29/2007 7:47:18 PM] Document apocentre The point in an elliptical orbit that lies farthest from the centre of mass of the orbiting system, such as a binary star or a planet and satellite.