1845–1912, English astronomer and mathematician; 2d son of Charles Darwin. He was Plumian professor (from 1883) of astronomy and experimental philos...
designation for two groups of intellectuals in mid-19th-century Russia that represented opposing schools of thought concerning the nature of Russian c...
1693–1762, English astronomer. His discovery of the aberration of light, announced in 1728, provided an important line of evidence for the motion of...
in the Roman Catholic Church, name of many independent communities of women. Most of them owe their origin to the institute of St. Vincent de Paul, fo...
missile or steerable bomb equipped with a laser, television, or satellite guidance system. Smart weapons, which use guidance systems that rely on exte...