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ether, in physics and astronomy

(Encyclopedia)ether or aether, in physics and astronomy, a hypothetical medium for transmitting light and heat (radiation), filling all unoccupied space; it is also called luminiferous ether. In Newtonian physics a...

lighting

(Encyclopedia)CE5 Incandescent lamp CE5 Basic fluorescent lamp lighting, light produced by artificial means to allow visibility in enclosures and at night. For stage lighting, see scene design and stage ligh...

Ångström, Anders Jöns

(Encyclopedia)Ångström, Anders Jöns änˈdərs yöns ōngˈström [key], 1814–74, Swedish physicist. He was educated at the Univ. of Uppsala and in 1839 became a member of its faculty. He is particularly noted...

Greb, Harry

(Encyclopedia)Greb, Harry, 1894–1926, American boxer, b. Pittsburgh. Although blind in one eye, Greb was one of the most feared fighters in American ring history. He was a natural middleweight, but fought light h...

Fizeau, Armand Hippolyte Louis

(Encyclopedia)Fizeau, Armand Hippolyte Louis ärmäNˈ ēpôlētˈ lwē fēzōˈ [key], 1819–96, French physicist. The first to measure (1849) the velocity of light in air, he also determined its speed in water. ...

cytology

(Encyclopedia)cytology sītŏlˈəjē [key], in biology, the study of the structure of all normal and abnormal components of cells and the changes, movements, and transformations of such components. The discipline ...

Michelson, Albert Abraham

(Encyclopedia)Michelson, Albert Abraham mīˈkəlsən [key], 1852–1931, American physicist, b. Strelno, Prussia, grad. Annapolis, 1873, and studied at Berlin, Heidelberg, and Paris. He was professor of physics at...

Local Group

(Encyclopedia)Local Group, in astronomy, loose cluster of at least 40 nearby galaxies, including our own Milky Way galaxy, the Andromeda Galaxy, and the Magellanic Clouds. The Local Group is spread over an ellipsoi...

seeing

(Encyclopedia)seeing, in astronomy, the clarity with which stars and other celestial objects can be observed. It is primarily determined by the atmosphere of the earth. The most obvious phenomenon is twinkling, whe...

near-death experience

(Encyclopedia)near-death experience, phenomenon reported by some people who have been clinically dead, then returned to life. Descriptions of the experience differ slightly in detail from person to person, but usua...