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space science

(Encyclopedia)space science, body of scientific knowledge as it relates to space exploration; it is sometimes also called astronautics. Space science draws on the conventional sciences of physics, chemistry, biolog...

Europa, in astronomy

(Encyclopedia)Europa yo͝orōˈpə [key], in astronomy, one of the 39 known moons, or natural satellites, of Jupiter. Magnetic-field data collected by the space probe Galileo in 2002 strongly indicated a liquid-wat...

outer space

(Encyclopedia)outer space: see space exploration. ...

Sandage, Allan Rex

(Encyclopedia)Sandage, Allan Rex, 1926–2010, American astronomer, b. Iowa City, Iowa, Ph.D. California Institute of Technology, 1953. He was a graduate student under Walter Baade and an assistant to Edwin Hubble....

space exploration

(Encyclopedia)CE5 Moon mission assembly CE5 Stages in a moon mission shown counterclockwise from launching on the first day to splashdown on the ninth day. space exploration, the investigation of physical co...

space biology

(Encyclopedia)space biology: see exobiology.

Giacconi, Riccardo

(Encyclopedia)Giacconi, Riccardo, 1931–2018, Italian-American astrophysicist, b. Milan, Italy, Ph.D. Univ. of Milan 1954. He was a researcher at American Science and Engineering Corporation (1959–73), professor...

Burbidge, Margaret

(Encyclopedia)Burbidge, Margaret, 1925–2020, Anglo-American astronomer, b. England as Eleanor Margaret Peachey. Burbidge; her husband, Geoffrey Burbidge; William Fowler; and Sir Fred Hoyle showed (1956) how heavi...

dark energy

(Encyclopedia)dark energy, repulsive force that opposes the self-attraction of matter (see gravitation) and causes the expansion of the universe to accelerate. The search for dark energy was triggered by the discov...

Voyager, space probes

(Encyclopedia)Voyager, in space exploration: see space exploration; space probe. ...