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Light Bulb
Light Bulb Background From the earliest periods of history until the beginning of the 19th century, fire was man's primary source of light. This light was produced through different means—torches, candles, oil and gas lamps. Besides the danger presented by an open... Read more |
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electric light
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Arc Light
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light pen
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Laser Technology
Laser Technology Laser devices use light to store, transfer, or print images and text; they are also used in a wide range of other applications, including surgery and weaponry. The coherent radiation of the laser gives it special strength. The laser (Light Amplification by... Read more |
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diffraction
diffraction bending of waves around the edge of an obstacle. When light strikes an opaque body, for instance, a shadow forms on the side of the body that is shielded from the light source. Ordinarily light travels in straight lines through a uniform, transparent medium, but those light waves that... Read more |
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space probe
space probe space vehicle carrying sophisticated instrumentation but no crew, designed to explore various aspects of the solar system (see space exploration ). Unlike an artificial satellite , which is placed in more or less permanent orbit around the earth, a space probe is launched with... Read more |
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airglow
airglow faint diffuse illumination of the night sky originating in the upper atmosphere. The energy in the form of visible light is derived from the sun's ultraviolet light, which ionizes atoms and dissociates molecules at heights between 40 and 200 mi (64-322 km) above the earth's surface. When... Read more |
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radar astronomy
radar astronomy application of radar to the determination of distances and planetary features within the solar system, such as rotation rates. A short burst of radio waves is transmitted in the direction of the object under study. The object reflects the radio waves back to earth, where they are... Read more |
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tachyon
tachyon , hypothetical elementary particle that travels only at speeds exceeding that of light. According to the theory of relativity , the speed of light is the limiting velocity for all ordinary material particles. Particles having nonzero rest mass can approach, but not reach, the speed of... Read more |
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Space Probe to End Moon Mission with a Bang
...09-01-2006 Space Probe to End Moon Mission...with the European Space Agency. We reached...Scientist, European Space Agency): We...infrastructure to send a fast taxi for the crew...peak of eternal light, and it's ... |
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Analysis: Twenty-fifth anniversary of the launch of the Voyager space probes
...of the Voyager space probes Host: IRA FLATOW...re listening to TALK OF THE NATION...On Monday's "Talk of the Nation," Neal Conan talks with Secretary...when people talk about the space...the smaller, ... |
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VOA NEWS: SPACE PROBES HEAD BEYOND SOLAR SYSTEM
...are the space probes that will not...through interstellar space. VOA's Paul...rocketed into space within weeks of...to interstellar space, we're still...been points of light and each was distinct...Neptune has the ... |
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White of knuckle, scientist wills Titan probe on
...of the Huygens probe, he first fashioned...instruments destined for space flight. Ideally...emotion when he talks about that part...in the Huygens probe. Finally, after...700 million probe, is within weeks...those could shed ... |
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Japan launches orbiter to probe greenhouse gases
...other piggyback probes on a Japanese H2A rocket. Japan's space agency, JAXA...measure reflected light from the Earth...global climate talks to determine more...readings from space should also enable...understand how fast CO2 ... |
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Science: Aliens beneath the ice? Is there life on Mars? Who cares -...
...surface using probes and diggers to...not to build a probe to fly alongside...that you cannot talk about Europa for...the vacuum of space by a layer of...most difficult space mission ever envisaged...stage is to send a space ... |
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Travel: Star quality; GET LOST IN SPACE, BECOME AN ASTRONAUT AND MEET A...
...Beagle 2 - our probe on Mars. There...demonstrations and talks by rocket scientists...holders. The Space Theatre is included...glasses to see Space Station 3D, the...Travel deep into space, far beyond the...galaxies millions of ... |
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Star cents: how the cost of NASA's next big space telescope...
...six times the light collecting area...the James Webb Space Telescope flies...NASA mission to probe the nature of...NASA's Goddard Space Flight Center...whole community talks itself into unrealistic...to the Hubble Space ... |
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NASA chief urges students to study, businesses to risk; Goldin talks of...
...inspirational talks to several hundred...the bathroom in space?" a student...with saving the space agency after the...all can go into space, and computers...million times faster than today's...goes twice as fast as the ... |
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Park District board to consider fast-tracking V3 compensation
...banks of high-beam lights in the center of...commissioners will talk about adjustments...ongoing internal probe, which is looking...at least for now, lights along the paths between...adequate amounts of light in the park, coming...entrances ... |