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| electromagnetic radiation |
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| Changing electric and magnetic fields that travel through space and transfer energy from one place to another; examples are light or radio waves |
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| The distance between successive peaks or though of a wave, usually represented by sigma |
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| The rate at which a vibration occurs that constitutes a wave, either in a material (as in sound waves), or in an electromagnetic field (as in radio waves and light), usually measured per second |
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| A particle representing a quantum of light or other electromagnetic radiation. A photon carries energy proportional to the radiation frequency but has zero rest mass |
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| An image or distribution of components of any electromagnetic radiation arranged in a progressive series according to wavelength |
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| A unit of length equal to one hundred-millionth of a centimeter, 1010 meter, used mainly to express wavelengths and interatomic distances |
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| Electromagnect radiation with wavelengths intermediate between visible light and radio waves |
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| Electromagnetic wave with wavelength, frequency and photon energy intermediate between infrared and radio waves. |
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| Electromagnetic wave with extremely long wavelengths, low frequency and small photon energy |
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| Having a wavelength shorter than that of the violet end of the visible spectrum but longer than that of X-rays |
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| Penetrating electromagnetic radiation of shorter wavelength than X-rays |
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| Electromagnetic radiation of high energy and very short wavelength (between ultraviolet light and gamma rays) that is able to pass through many materials opaque to light |
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| A narrow range of wavelengths in which the atmosphere absorbs very little of the Earth’s emitted energy. |
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| A telescope that uses a converging lens to collect light |
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| A telescope in which a mirror is used to collect and focus light |
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| In a refracting telescope, the largest mirror |
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| A primary mirror (or primary) is the principal light-gathering surface (the objective) of a reflecting telescope. |
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| The lens or group of lenses that is closest to the eye in a microscope, telescope, or other optical instrument. |
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| The distance between the center of a lens or curved mirror and its focus. |
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| A telescope lens compsed of two lenses ground form different kinds of glass and designed to bring two slected colors to the same focuas and correct for chromatic aberrations |
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| A telescope that cather and focuses visible light. |
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| A telescope that gathers and focuses electromagentic energy with microwave and radio wavelengths. |
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| The ability of a telescope to collect light, proportional to the area of the telescope's objective lens or mirror |
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| The ability of a telescope to reveal fine detial. Depends on the diameter of the telescope objective |
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| Blurred fringe surrounding any image, caused by the wave properites of light Becase of this no detail small than the fringe can be seen |
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| The ability of a telescope to make an image larger |
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| The illuminationof the night sky by waste light from cities and outdoor lighting , which prevents the observation of faint object |
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| The point at which the objective mirror forms an image in relecting telescope |
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| In a reflecting telescope, a mirror that directs the light from the primary mirror to a focal position |
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| The optical design in which the secondary mirror reflects on dramtic and unlikely events, such as collision of two starts to produce our solar system |
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| The optical design in which a diagonal mirror relects ligh out the side of the telescope tube for easier access. |
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| the optical design that uses a thin corrector plate at the entrance to the telescope ture. A popular design for small telescopes. |
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| The motor and gears on a telescope that turn in westward to keep it pointed at a star |
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| A telescope mounting that allows motion to parallel to and perpendicular to the celetial equator |
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| A telescope mounting that allows the telescope to move in altitude and in azimuth (parallel to the horizon) |
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| A computer-controlled opitical system in a astronmoical telescope used to partially corrent for seeing |
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| An instrument attacted to a scope for the propuse of percisely measuring the brightness of stars or other objects at one or more wavelegnths |
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| Charge-coupled devices (CCDs) |
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| An electronic device consisting of a large array of light-sensitive elements used to record very faint images |
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| Information coverted to numerical form for convenitent transger, storage and analysis |
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| A grid of photosensitive dectors for the purpose of recording images. |
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| Describes an image in which information invisible to human eys is represented by visible colors chosen to best convey certian detils Also called false color |
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| A reprsentation of a graphical data added or enhanced color to reveal detail |
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| A line in a spectrum at a specific wavelegnths to produce a spectrum |
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| A computer-controlled optical system in an astronomical telscope used to partially correct for seeing. |
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| An artificial star image produced my a laser pointing up into Earth's atmosphere use as reference in adaptive opitics systems |
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| A subatomic particle traveling at tremendous velocity that stikes the Earth's atmosphere from space |
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