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Black Musicians

  Notable African-American Musicians     The following list includes African-American singers, composers, rappers, pianists, and other musicians who have contributed to the…

Texas

Texas State Facts Entered Union: Dec. 29, 1845 (28th State) Organized as republic: 1836 Present constitution adopted: 1876 Fun Facts State abbreviation/Postal code: Tex./TX Nickname: The…

observatory, orbiting

(Encyclopedia) observatory, orbiting, research satellite designed to study solar radiation, electromagnetic radiation from distant stars, the earth's atmosphere, or the like. Because the atmosphere…

virtual observatory

(Encyclopedia) virtual observatory, a collection of integrated astronomical data archives and software tools that utilize computer networks to create an environment in which research can be conducted…

DK Science: Light

WAVES AND PARTICLESLIGHTHOUSETRANSMISSION OF LIGHTLIGHT SOURCESSHADOWSFIND OUT MORELight makes the world seem bright and colourful to our eyes. Light is a type of electromagnetic radiation that…

Gordy, Berry, Jr.

(Encyclopedia) Gordy, Berry, Jr., 1929–, African-American music-industry executive, b. Detroit. After stints in the army and as a professional boxer,…

neutron star

(Encyclopedia) neutron star, extremely small, extremely dense star, with as much as double the sun's mass but only a few miles in radius, in the final stage of stellar evolution. Astronomers Baade…

DK Science: Refraction

PUZZLE FOR THE EYEREFRACTION IN HEAT HAZEMIRAGEFIND OUT MORELight rays usually travel in straight lines, but when they pass from one material to another they can be forced to bend (change…

The Sun

Source: The National Aeronautics and Space Administration (NASA) The diameter of our closest star, the Sun, is 1,392,000 kilometers. The Sun is thought to be 4.6 billion years old. The Sun is a…

bremsstrahlung

(Encyclopedia) bremsstrahlungbremsstrahlungbrĕmˈshträˌləng [key]: see X ray.