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10 Cards in this Set
- Front
- Back
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Astronomer |
an expert in or student of astronomy. |
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catadioptric telescope |
is one where refraction and reflection are combined in an optical system, usually via lenses (dioptrics) and curved mirrors (catoptrics). |
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constellation |
n modern astronomy, a constellation is a specific area of the celestial sphere as defined by the International Astronomical Union |
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electromagnetic (EM) radiation |
Electromagnetic radiation (EM radiation or EMR) is a form of radiant energy released by certain electromagnetic processes. |
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electromagnetic spectrum |
the range of wavelengths or frequencies over which electromagnetic radiation extends. |
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frequency |
the rate at which something occurs or is repeated over a particular period of time or in a given sample. |
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gamma ray |
penetrating electromagnetic radiation of a kind arising from the radioactive decay of atomic nuclei. |
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infrared light |
infrared light is one type of light that is invisible to us |
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light-year |
a unit of astronomical distance equivalent to the distance that light travels in one year, which is 9.4607 × 1012 km (nearly 6 trillion miles). |
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microwave |
an electromagnetic wave with a wavelength in the range 0.001–0.3 m, shorter than that of a normal radio wave but longer than those of infrared radiation. Microwaves are used in radar, in communications, and for heating in microwave ovens and in various industrial processes. |
