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ether, in physics and astronomy

(Encyclopedia)ether or aether, in physics and astronomy, a hypothetical medium for transmitting light and heat (radiation), filling all unoccupied space; it is also called luminiferous ether. In Newtonian physics a...

Bellerophon

(Encyclopedia)Bellerophon bəlĕrˈəfŏn, –fən [key], in Greek mythology, son of Glaucus (3;) originally called Hipponoüs. He changed his name after he murdered a countryman and was forced to flee to exile. He...

Hippocrene

(Encyclopedia)Hippocrene hĭpˈəkrēnˌ [key]: see Muses and Pegasus, in mythology. ...

infrared astronomy

(Encyclopedia)infrared astronomy, study of celestial objects by means of the infrared radiation they emit, in the wavelength range from about 1 micrometer to about 1 millimeter. All objects, from trees and building...

neutrino astronomy

(Encyclopedia)neutrino astronomy, study of stars by means of their emission of neutrinos, fundamental particles that result from nuclear reactions and are emitted by stars along with light. Approximately 100 billio...

ultraviolet astronomy

(Encyclopedia)ultraviolet astronomy, study of celestial objects by means of the ultraviolet radiation they emit, in the wavelength range from about 90 to about 350 nanometers. Ultraviolet (UV) line spectrum measure...

radar astronomy

(Encyclopedia)radar astronomy, application of radar to the determination of distances and planetary features within the solar system, such as rotation rates. A short burst of radio waves is transmitted in the direc...

radio astronomy

(Encyclopedia)radio astronomy, study of celestial bodies by means of the electromagnetic radio frequency waves they emit and absorb naturally. Radio waves also come from outside the Milky Way. These extragalact...

Acrocorinthus

(Encyclopedia)Acrocorinthus ăkˌrōkərĭnˈthəs [key], acropolis, or citadel, of Corinth, overlooking the ancient city. Some ruins of the acropolis remain. The Acrocorinthus was the site of a temple of Aphrodite...

gamma-ray astronomy

(Encyclopedia)gamma-ray astronomy, study of astronomical objects by analysis of the most energetic electromagnetic radiation they emit. Gamma rays are shorter in wavelength and hence more energetic than X rays (see...