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planetary science

(Encyclopedia)planetary science or planetology, study of planets and planetary systems as a whole. Planetary science applies the theories and methods of traditional disciplines such as astronomy, geology, physics, ...

catastrophism

(Encyclopedia)catastrophism kətăsˈtrəfĭzəm [key], in geology, the doctrine that at intervals in the earth's history all living things have been destroyed by cataclysms (e.g., floods or earthquakes) and replac...

Crane, Hart

(Encyclopedia)Crane, Hart (Harold Hart Crane), 1899–1932, American poet, b. Garrettsville, Ohio. He published only two volumes of poetry during his lifetime, but those works established Crane as one of the most o...

hyena

(Encyclopedia)hyena hī-ēˈnə [key], carnivorous, chiefly nocturnal mammal of the Old World family Hyaenidae. Although doglike in appearance, hyenas are more closely related to civets (family Viverridae) and cats...

Gray, Thomas

(Encyclopedia)Gray, Thomas, 1716–71, English poet. He was educated at Eton and Peterhouse, Cambridge. In 1739 he began a grand tour of the Continent with Horace Walpole. They quarreled in Italy, and Gray returned...

Mount Wilson Observatory

(Encyclopedia)Mount Wilson Observatory, astronomical observatory located in California on Mt. Wilson, near Pasadena. Mt. Wilson Observatory was founded in 1904 by George E. Hale. Its equipment includes 100-in. (2.5...

armor

(Encyclopedia)armor, apparatus for defense of persons, horses, and such objects as vehicles, naval vessels, and aircraft. Body armor developed early as protective suits made of such materials as leather, shells, wo...

white dwarf

(Encyclopedia)white dwarf, in astronomy, a type of star that is abnormally faint for its white-hot temperature (see mass-luminosity relation). Typically, a white dwarf star has the mass of the sun and the radius of...

zoology

(Encyclopedia)zoology, branch of biology concerned with the study of animal life. From earliest times animals have been vitally important to man; cave art demonstrates the practical and mystical significance animal...

tree shrew

(Encyclopedia)tree shrew, small, arboreal mammal of the family Tupaiidae, found in S Asia. The 17 known species of tree shrews are classified as the order Tupaioidea or Scandentia. Tree shrews superficially resembl...