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| a technology used with reflecting telescopes developed in the 1980s, which actively shapes a telescope's mirrors to prevent deformation due to external influences such as wind, temperature, |
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| a technology used to improve the performance of optical systems by reducing the effect of wavefront distortions. ... |
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| the ability of any image-forming device such as an optical or radio telescope, a microscope, a camera, or an eye, to distinguish small details of an object, thereby making it a major determinant of image resolution. |
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| a combination of a primary concave mirror and a secondary convex mirror, |
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| charge-coupled device (CCD) |
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| charge-coupled device, a high-speed semiconductor used chiefly in image detection. |
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| telescope in which light from the primary mirror is reflected along the polar axis to additional mirrors, and in which the focus (coudé focus) is independent of the telescope's motion. |
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| the range of wavelengths or frequencies over which electromagnetic radiation extends |
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| a type of lens that is attached to a variety of optical devices such as telescopes and microscopes. |
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| the distance between the center of a lens or curved mirror and its focus. |
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| the plane through the focus perpendicular to the axis of a mirror or lens |
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| the point at which rays or waves meet after reflection or refraction, or the point from which diverging rays or waves appear to proceed. |
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the rate at which a vibration occurs that constitutes a wave, either in a material or in an electromagnetic field
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| penetrating electromagnetic radiation of shorter wavelength than X-rays. |
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| electromagnetic radiation with wavelengths longer than visible light but shorter than radio waves |
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| A measure of the light-gathering ability of a telescope |
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| the action or process of magnifying something or being magnified, esp. visually. |
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| reflecting telescope in which the image is viewed through an eyepiece perpendicular to main axis |
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| the lens in a telescope or microscope nearest to the object observed |
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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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| a minute area of illumination on a display screen, one of many from which an image is composed |
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| the principal light-gathering surface of a reflecting telescope |
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| the focal point of the objective lens or primary mirror of a telescope |
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| an instrument used to detect radio emissions from the sky, whether from natural celestial objects or from artificial satellites. |
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| an electromagnetic wave of a frequency between about 104 and 1011 or 1012 Hz, as used for long-distance communication. |
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| reflecting telescope (reflector) |
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| A telescope in which light from the object is gathered and focused by a concave mirror, with the resulting image magnified by the eyepiece |
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| the throwing back by a body or surface of light, heat, or sound without absorbing it |
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| a telescope that uses a converging lens to collect light |
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| spheric lens which is designed to correct the spherical aberration in the spherical primary mirror it is combined with. |
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| the second deflecting or focusing mirror element in a reflecting telescope. Light gathered by the primary mirror is directed towards a focal point typically past the location of the secondary. |
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| Astronomical seeing refers to the blurring and twinkling of astronomical objects such as stars caused by turbulent mixing in the Earth's atmosphere varying the optical refractive index. |
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| a band of colors, as seen in a rainbow, produced by separation of the components of light by their different degrees of refraction according to wavelength. |
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| a loss of definition in the image arising from the surface geometry of a spherical mirror or lens. |
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| shine with a gleam that varies repeatedly between bright and faint. |
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| ultraviolet radiation (uv) |
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| radiation lying in the ultraviolet range; wave lengths shorter than light but longer than X rays |
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| very - long - baseline - interferometry (VLBI) |
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Definition
| a type of astronomical interferometry used in radio astronomy. In VLBI a signal from an astronomical radio source, such as a quasar, is collected at multiple radio telescopes on Earth. ... |
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| the distance between successive crests of a wave, esp. points in a sound wave or electromagnetic wave |
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| two fixed points on the interior of an ellipse used in the formal definition of a curve. |
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