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petrology

(Encyclopedia) petrology, branch of geology specifically concerned with the origin, composition, structure, and properties of rocks, primarily igneous and metamorphic, and secondarily sedimentary. It…

Rosse, William Parsons, 3d earl of

(Encyclopedia) Rosse, William Parsons, 3d earl ofRosse, William Parsons, 3d earl ofrôs [key], 1800–1867, British astronomer and constructor of telescopes. He served as member of Parliament for King's…

planetarium

(Encyclopedia) planetarium, optical device used to project a representation of the heavens onto a domed ceiling; the term also designates the building that houses such a device. A modern planetarium…

Harris, Julie

(Encyclopedia) Harris, Julie, 1925–2013, American actress, b. Grosse Point, Mich. Harris made her New York debut in It's a Gift (1945). Her versatility and power won her enormous critical acclaim,…

Hercules cluster

(Encyclopedia) Hercules cluster, giant globular star cluster in the northern constellation Hercules; cataloged as M13 or NGC 6205. The cluster is just visible to the naked eye and is the best example…

Lalande, Joseph Jérôme Lefrançais de

(Encyclopedia) Lalande, Joseph Jérôme Lefrançais deLalande, Joseph Jérôme Lefrançais dezhôzĕfˈ zhārōmˈ ləfräNsāˈ də [key]Lalande, Joseph Jérôme Lefrançais de läläNdˈ [key], 1732–1807, French…

Lemonnier, Pierre Charles

(Encyclopedia) Lemonnier, Pierre CharlesLemonnier, Pierre Charlespyĕr shärl ləmônyāˈ [key], 1715–99, French astronomer. For many years he was professor of physics at the Collège de France. He studied…

Burnett, Carol

(Encyclopedia) Burnett, CarolBurnett, Carolbərnĕtˈ [key], 1936–, American television performer, b. San Antonio, Tex. Beginning her show-business life as a singer, she soon turned to comedy. After…

Carruthers, George Richard

(Encyclopedia) Carruthers, George Richard, 1939-2020, African-American astrophysicist, b. Cincinnati, OH, Univ. of Illinois at Urbana-Champaign (BS,…