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unidentified flying object
unidentified flying object or UFO, an object or light reportedly seen in the sky whose appearance, trajectory, and general dynamic and luminescent behavior do not readily suggest a logical, conventional explanation. Some of these phenomena have been photographed and others correlated with radar...
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UFO
UFO a mysterious object seen in the sky (an Unidentified Flying Object) for which it is claimed no orthodox scientific explanation can be found. UFO incidents range from sightings of unidentified lights in the sky to accounts of supposed abductions by alien beings....
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Walter Philip Reuther
Walter Philip Reuther , 1907-70, American labor leader, b. Wheeling, W.Va. A tool- and diemaker, he became shop foreman in a Detroit automobile plant, meanwhile completing his high school work and attending college. Discharged because of his union activities, he and his brother Victor spent some yea...
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trompe-l'œil
trompe-l'œil (Fr.: ‘deceives the eye’). Term applied to a painting (or a detail of one) that is intended to deceive the spectator (if only briefly) into thinking that it is a real object rather than a two-dimensional representation of it. Such virtuoso displays of skill often hav...
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sonar
sonar , device used underwater for locating submerged objects and for submarine communication by means of sound waves. The term sonar is an acronym for so und na vigation r anging. The main component of sonar equipment is an electroacoustic transducer that is in direct contact with the water. I...
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centripetal force and centrifugal force
centripetal force and centrifugal force action-reaction force pair associated with circular motion . According to Newton's first law of motion, a moving body travels along a straight path with constant speed (i.e., has constant velocity ) unless it is acted on by an outside force . For circular ...
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court handball
court handball indoor or outdoor game played by striking a ball against a wall or walls with the palm of the hand. Play may be for singles or doubles (four players) on a court with one, three, or four walls. The court is typically 20 ft (6.1 m) by 34 ft (10.4 m) with a short line, from behind which...
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aerial and satellite photography
aerial and satellite photography technology and science of taking still or moving-picture photographs from a camera mounted on a balloon, airplane, satellite, rocket, or spacecraft. In the 19th cent., photographers such as Thaddeus Lowe and George R. Lawrence took impressive pictures with cameras s...
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airplane
airplane aeroplane, or aircraft, heavier-than-air vehicle, mechanically driven and fitted with fixed wings that support it in flight through the dynamic action of the air.
Parts of an Airplane
The airplane has six main parts—fuselage, wings, stabilizer (or tail plane), ...
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eye
eye organ of vision and light perception. In humans the eye is of the camera type, with an iris diaphragm and variable focusing, or accommodation. Other types of eye are the simple eye, found in many invertebrates, and the compound eye, found in insects and many other arthropods. In an alternate ...
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