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earth, in geology and astronomy

(Encyclopedia)CE5 A. Cross section of the earth, showing its shells B. Detailed cross section of the crust and upper mantle: The lithosphere consists of the hard rock in the crust and upper mantle, lying above t...

National Radio Astronomy Observatory

(Encyclopedia)National Radio Astronomy Observatory (NRAO), federal observatory for radio astronomy, founded in 1956 and operated under contract with the National Science Foundation by Associated Universities, Inc.,...

Pleiades, in Greek mythology

(Encyclopedia)Pleiades, in Greek mythology, seven daughters of Atlas and the nymph Pleione. According to one legend they were the attendants of Artemis and were changed into stars by the gods when they were pursued...

Bond, William Cranch

(Encyclopedia)Bond, William Cranch, 1789–1859, American astronomer, b. Portland, Maine. He early aided his father in the trades of silversmith and clockmaker in Boston. He soon became an expert in the making of c...

atlas, in geography

(Encyclopedia)atlas, in geography, collection of maps or charts. It usually includes data on various features of a country, e.g., its topography, natural resources, climate, and population, as well as its agricultu...

Bellatrix

(Encyclopedia)Bellatrix bĕlˈətrĭks [key], bright star in the constellation Orion; Bayer designation Gamma Orionis; 1992 position R.A. 5h24.7m, Dec. +6°21′. A bluish-white giant of spectral class B2 III, its ...

Canis Minor

(Encyclopedia)Canis Minor [Lat.,=lesser dog], small constellation ying near the celestial equator, E of Orion and NE of Canis Major, the Large Dog. Known as the Small Dog, Canis Minor is traditionally identified as...

Betelgeuse

(Encyclopedia)Betelgeuse bētˈəljo͞ozˌ [key], bright star in the constellation Orion; Bayer designation α Orionis; 1992 position R.A. 5h54.8m, Dec. +7°24′. A red supergiant with a luminosity about 13,000 ti...

Messier catalog

(Encyclopedia)Messier catalog mĕsyāˈ [key], systematic list of nebulae and star clusters. A first list, compiled and published in 1771 by Charles Messier, contained 45 objects. The final list, published in 1784,...

Horsehead Nebula

(Encyclopedia)Horsehead Nebula, dark nebula located in the constellation Orion; designated IC 434 or B 33. It consists of a cloud of nonluminous interstellar matter resembling the outline of a horse's head and appe...