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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 ...

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...

Robinson, Sugar Ray

(Encyclopedia)Robinson, Sugar Ray, 1920–89, American boxer, b. Detroit as Walker Smith, Jr. He began boxing after three years of high school in New York City. Having won all his amateur fights (about 90), includi...

Palmer, Ray

(Encyclopedia)Palmer, Ray, 1808–87, American Congregational clergyman and hymn writer, b. Little Compton, R.I., grad. Yale, 1830. He held pastorates in Bath, Maine (1835–50), and Albany, N.Y. (1850–66). He is...

Charles, Ray

(Encyclopedia)Charles, Ray (Ray Charles Robinson), 1930–2004, African-American musician and composer, b. Albany, Ga. Blinded at age seven, he was raised in Florida and at 16 began singing in a local hillbilly gro...

Gamma-Ray Observatory

(Encyclopedia)Gamma-Ray Observatory: see gamma-ray astronomy. ...

Kroc, Ray

(Encyclopedia)Kroc, Ray (Raymond Albert Kroc), 1902–84, American fast-food restauranteur and franchiser, b. Chicago. Kroc held several jobs before becoming (1937) the distributor for a blender that simultaneously...

ray, in physics

(Encyclopedia)ray, in physics, term denoting the straight line along which light or other form of radiation is propagated from its source. It generally refers to the line of propagation of waves but is also applied...