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Mira

(Encyclopedia)Mira mīˈrə [key], [Lat.,=marvelous], variable star in the constellation Cetus; Bayer designation Omicron Ceti; 1992 position R.A. 2h19.0m, Dec. −3°05′. The most famous long-period variable, Mi...

Andromeda Galaxy

(Encyclopedia)Andromeda Galaxy, cataloged as M31 and NGC 224, the closest large galaxy to the Milky Way and the only one visible to the naked eye in the Northern Hemisphere. It is also known as the Great Nebula in ...

Doppler effect

(Encyclopedia)Doppler effect, change in the wavelength (or frequency) of energy in the form of waves, e.g., sound or light, as a result of motion of either the source or the receiver of the waves; the effect is nam...

brown dwarf

(Encyclopedia)brown dwarf, in astronomy, celestial body that is larger than a planet but does not have sufficient mass to convert hydrogen into helium via nuclear fusion as stars do. Also called “failed stars,”...

Lockyer, Sir Joseph Norman

(Encyclopedia)Lockyer, Sir Joseph Norman lŏkˈyər [key], 1836–1920, English astronomer, educated on the Continent. One of the first to make a spectroscopic examination of the sun and stars, he devised (1868), i...

Priestley, J. B.

(Encyclopedia)Priestley, J. B. (John Boynton Priestley), 1894–1984, English author. An extraordinarily prolific writer, Priestley worked in a variety of genres. He first wrote literary criticism as a student at C...

magnetic resonance

(Encyclopedia)magnetic resonance, in physics and chemistry, phenomenon produced by simultaneously applying a steady magnetic field and electromagnetic radiation (usually radio waves) to a sample of atoms and then a...

color

(Encyclopedia)color, effect produced on the eye and its associated nerves by light waves of different wavelength or frequency. Light transmitted from an object to the eye stimulates the different color cones of the...

antibiotic

(Encyclopedia)antibiotic, any of a variety of substances, usually obtained from microorganisms, that inhibit the growth of or destroy certain other microorganisms. Although for centuries preparations derived from ...

Bennett, Naftali

(Encyclopedia) Bennett, Naftali, 1972-, Israeli politician and prime minister (2021-), b. Haifa. The son of American immigrant parents, Naftali served in the Israeli ...