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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...

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...

X-ray astronomy

(Encyclopedia)X-ray astronomy, study of celestial objects by means of the X rays they emit, in the wavelength range from 0.01 to 10 nanometers. X-ray astronomy dates to 1949 with the discovery that the sun emits X ...

Canis Major

(Encyclopedia)Canis Major kāˈnĭs [key] [Lat.,=greater dog], constellation lying near the celestial equator, SE of Orion. Known as the Large Dog (Canis Minor is the Small Dog), it was associated with the figure o...

In

(Encyclopedia)In, symbol for the element indium. ...

Rigel

(Encyclopedia)Rigel rīˈjəl [key], bright star in the constellation Orion; Bayer designation Beta Orionis; 1992 position R.A. 5h14.2m, Dec. −8°13′. A huge, blue supergiant of spectral class B8 Ia, Rigel has ...

Merope

(Encyclopedia)Merope mĕrˈəpē [key], in Greek mythology. 1 One of the Pleiades. She was the wife of Sisyphus, king of Corinth, and the mother of Glaucus. According to one legend she became the lost Pleiad becaus...

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.,...