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Vega

(Encyclopedia)Vega vāˈgə [key], brightest star in the constellation Lyra; Bayer designation Alpha Lyrae; 1992 position R.A. 18h36.7m, Dec. +38°47′. A white main-sequence star of spectral class A0 V, its appar...

Sorabji, Cornelia

(Encyclopedia)Sorabji, Cornelia sōräbˈjē [key], c.1870–1954, Indian lawyer and author. She took a law degree at Oxford in 1893. She served (1904–23) as a special legal adviser to the Court of Wards of Benga...

sky

(Encyclopedia)sky, apparent dome over the earth, background of the clouds, sun, moon, and stars. The blue color of the clear daytime sky results from the selective scattering of light rays by the minute particles o...

airglow

(Encyclopedia)airglow, faint diffuse illumination of the sky originating in the upper atmosphere. Although it occurs at all times of day throughout the upper atmosphere, it is most typically visible to an observer ...

Bode, Johann Elert

(Encyclopedia)Bode, Johann Elert yōˈhän āˈlĕrt bōˈdə [key], 1747–1826, German astronomer. From 1772 to 1825 he was astronomer of the Academy of Science, Berlin, and from 1786, director of the Berlin Obse...

transit

(Encyclopedia)transit, in astronomy, passage of a body across a meridian or passage of a small body across the visible disk of a larger one. (The passage of a large body across a smaller one is called an eclipse or...

stratosphere

(Encyclopedia)stratosphere strătˈəsfēr [key], second lowest layer of the earth's atmosphere. The level from which it extends outward varies with latitude; it begins c.51⁄2 mi (9 km) above the poles, c.6 or 7 ...

astronomy

(Encyclopedia)astronomy, branch of science that studies the motions and natures of celestial bodies, such as planets, stars, and galaxies; more generally, the study of matter and energy in the universe at large. ...

Pluto, in astronomy

(Encyclopedia)Pluto, in astronomy, a dwarf planet and the first Kuiper belt, or transneptunian, object (see comet) to be discovered (1930) by astronomers. Pluto has an elliptical orbit usually lying beyond that of ...

Jerusalem artichoke

(Encyclopedia)Jerusalem artichoke, tuberous-rooted perennial (Helianthus tuberosus) of the family Asteraceae (aster family), native to North America, where it was early cultivated by the indigenous inhabitants. In ...