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Perrine, Charles Dillon

(Encyclopedia)Perrine, Charles Dillon pərīnˈ [key], 1867–1951, American astronomer, b. Steubenville, Ohio. He was on the staff of Lick Observatory (1893–1909) and was (1909–36) director of the Argentine Na...

Paullus, Aemilius

(Encyclopedia)Paullus, Aemilius (Lucius Aemilius Paullus Macedonicus) ēmĭlˈēəs [key], c.229–160 b.c., Roman general. He was curule aedile (193 b.c.), praetor (191), and consul (182). In his consulship he con...

Andromeda, in Greek mythology

(Encyclopedia)Andromeda ăndrŏmˈĭdə [key], in Greek mythology, princess of Ethiopia, daughter of King Cepheus, king of Ethiopia, and Cassiopeia. According to most legends Cassiopeia angered Poseidon by saying t...

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 ...

In

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

Cesari, Giuseppe

(Encyclopedia)Cesari, Giuseppe, called Cavaliere d'Arpino jo͞ozĕpˈpā chāˈzärē kävälyāˈrā därpēˈnō [key], 1568–1640, Italian late mannerist painter. Cesari's outstanding works are the frescoes in ...

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.,...

Nuffield Radio Astronomy Laboratories

(Encyclopedia)Nuffield Radio Astronomy Laboratories: see Jodrell Bank Observatory. ...

meteor shower

(Encyclopedia)meteor shower, increase in the number of meteors observed in a particular part of the sky. The trails of the meteors of a meteor shower all appear to be traceable back to a single point in the sky, kn...