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Mercury, in astronomy

(Encyclopedia)Mercury, in astronomy, nearest planet to the sun, at a mean distance of 36 million mi (58 million km); its period of revolution is 88 days. Mercury passes through phases similar to those of the moon a...

Ride, Sally Kristen

(Encyclopedia)Ride, Sally Kristen 1951–2012, American astrophysicist and astronaut, b. Encino, Calif. With an M.A. in physics (1975) and a Ph.D. in astrophysics from Stanford Univ., she joined NASA in 1978, where...

astronaut

(Encyclopedia)astronaut, crew member on a U.S. manned spaceflight mission; the Soviet term is cosmonaut. Candidates for manned spaceflight are carefully screened to meet the highest physical and mental standards, a...

piculet

(Encyclopedia)piculet pĭkˈyələt [key], common name for a small bird of the family Picidae, which includes the woodpecker and the wryneck. Like the true woodpeckers, piculets are large-headed and have long, stic...

El Segundo

(Encyclopedia)El Segundo ĕl sēgŭnˈdō [key], industrial city (2020 pop. 16,504), Los Angeles co., S Calif., on ...

Titusville

(Encyclopedia)Titusville tīˈtəsvĭl [key], city (1990 pop. 39,394), seat of Brevard co., E Fla., on Indian River (a lagoon); inc. 1886. It is a growing, regional trade center. The construction in the 1950s of th...

Baikonur Cosmodrome

(Encyclopedia)Baikonur or Baykonur Cosmodrome both: bīˌkəno͞orˈ [key], formerly secret aerospace launch complex, Qyzylorda prov., S central Kazakhstan, near Baikonur (originally, 1958–95, Leninsk) but c.200 ...

vacuum

(Encyclopedia)vacuum, theoretically, space without matter in it. A perfect vacuum has never been obtained; the best human-generated vacuums contain less than 100,000 gas molecules per cc, compared to about 30 billi...

Edwards Air Force Base

(Encyclopedia)Edwards Air Force Base, U.S. military installation, 301,000 acres (121,805 hectares), S Calif., NE of Lancaster; est. 1933. It is one of the largest air force bases in the United States and has the wo...

Alexander, Samuel

(Encyclopedia)Alexander, Samuel, 1859–1938, British philosopher, b. Australia. From 1893 to 1924 he was professor of philosophy at Victoria Univ., Manchester. Strongly influenced by the theory of evolution, Alexa...