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space station

(Encyclopedia)space station or space platform, artificial earth satellite, usually manned, that is placed in a fixed orbit and can serve as a base for astronomical observations; zero-gravity materials processing; s...

binary star

(Encyclopedia)CE5 A. Eclipsing binary: Primary component passing behind secondary (dimmer) component B. Light curve for eclipsing binary binary star or binary system, pair of stars that are held together by the...

Hyperion, in astronomy

(Encyclopedia)Hyperion hīpērˈēən [key], in astronomy, one of the named moons, or natural satellites, of Saturn. Also known as Saturn VII (or S7), Hyperion is the largest highly irregular (nonspherical) body in...

Moore, Michael

(Encyclopedia)Moore, Michael, 1954–, American documentary filmmaker, author, and activist, b. Flint, Mich. A highly personal, populist, and frequently controversial and polarizing documentary filmmaker, he made h...

Sedna

(Encyclopedia)Sedna, in astronomy, the most distant known large object in the solar system. With a highly eccentric elliptical orbit that ranges from an estimated 76 AU to 937 AU, Sedna also has an extremely long o...

Stirling engine

(Encyclopedia)Stirling engine, an external combustion reciprocating engine having an enclosed working fluid that is alternately compressed and expanded to operate a piston, thus converting heat from a variety of so...

energy, sources of

(Encyclopedia)energy, sources of, origins of the power used for transportation, for heat and light in dwelling and working areas, and for the manufacture of goods of all kinds, among other applications. The develop...

Galileo

(Encyclopedia)Galileo (Galileo Galilei) gălˌĭlēˈō; gälēlĕˈō gälēlĕˈē [key], 1564–1642, great Italian astronomer, mathematician, and physicist. By his persistent investigation of natural laws he la...

Enceladus

(Encyclopedia)Enceladus ĕnsĕlˈədəs [key], in astronomy, one of the named moons, or natural satellites, of Saturn. Also known as Saturn II (or S2), Enceladus is 310 mi (500 km) in diameter, orbits Saturn at a m...

Amenhotep III

(Encyclopedia)Amenhotep III ăˌmĕnōˈfĭs [key], d. c.1372 b.c., king of ancient Egypt, of the XVIII dynasty. He succeeded his father, Thutmose IV, c.1411 b.c. His reign marks the culmination and the start of th...