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“red”
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“red”
red dwarf
A small, relatively cool star with low luminosity.
This entry is located in the following unit:
Astronomy and related astronomical terms
(page 21)
red giant
A star with a relatively low surface temperature, a few thousand degrees at most and radius between 10 and 100 times that of the sun.
Such objects are representative of stars at the end of their evolutionary life.
This entry is located in the following unit:
Astronomy and related astronomical terms
(page 21)
red shift
1. The observed shift of the characteristic spectral lines of, for example, a galaxy, toward the red, longer-wavelength, end of the spectrum as a result of the galaxy's recession from the earth.
2. The lengthening of the wavelengths of light from an object as a result of the object's motion away from the earth.
2. The lengthening of the wavelengths of light from an object as a result of the object's motion away from the earth.
It is an example of the Doppler effect. The red shift in light from galaxies is evidence that the universe is expanding.
This entry is located in the following unit:
Astronomy and related astronomical terms
(page 21)