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Hertzsprung, Ejnar

(Encyclopedia)Hertzsprung, Ejnar īˈnär hĕrtsˈspro͞ong [key], 1873–1967, Danish astronomer. Although trained as a chemical engineer, Hertzsprung made his career in astronomy, specializing in exacting photogr...

Antares

(Encyclopedia)Antares ăntârˈēz [key], brightest star in the constellation Scorpius; Bayer designation Alpha Scorpii; 1992 position R.A. 16h27.6m, Dec. −26°22′. A red supergiant of spectral class M1, Antare...

Hadar, in astronomy

(Encyclopedia)Hadar or Beta Centauri bāˈtə sĕntôrˈē [key], bright star in the constellation Centaurus; 1992 position R.A. 14h01.7m, dec. −60°13′. A bluish-white giant of spectral class B1 II, it has an ...

Wise Men of the East

(Encyclopedia)Wise Men of the East, Magi, or Three Kings, men who came from the East to adore the newborn Jesus. Mat. 2. They were the first to tell Herod of the birth. A star (the Star of Bethlehem) had been a si...

atomic mass

(Encyclopedia)atomic mass, the mass of a single atom, usually expressed in atomic mass units (amu). Most of the mass of an atom is concentrated in the protons and neutrons contained in the nucleus. Each proton or n...

Osheroff, Douglas Dean

(Encyclopedia)Osheroff, Douglas Dean, 1945–, American physicist, b. Aberdeen, Wash., Ph.D. Cornell, 1973. He was a professor at Cornell from 1973 to 1987, when he joined the faculty at Stanford. Osheroff was also...

Welch, Jack

(Encyclopedia)Welch, Jack (John Francis Welch, Jr.), 1935–2020, American business executive, b. Salem, Mass., grad. Univ. of Massachusetts (1957); Univ. of Illinois (M.S., 1958; Ph.D., chemical engineering, 1960)...

Pawnee

(Encyclopedia)Pawnee pônēˈ [key], Native North Americans whose language belongs to the Caddoan branch of the Hokan-Siouan linguistic stock (see Native American languages). At one time the Pawnee lived in what is...

red giant

(Encyclopedia)red giant, star that is relatively cool but very luminous because of its great size. All normal stars are expected to pass eventually through a red-giant phase as a consequence of stellar evolution. A...

gravitation

(Encyclopedia)gravitation, the attractive force existing between any two particles of matter. The term gravitygravity is commonly used synonymously with gravitation, but in correct usage a definite distinction is...