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radial motion
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radial motion
noun Astronomy.
the component of the motion of a star away from or toward the earth along its line of sight, expressed in miles or kilometers per second and determined by the shift in the wavelength of light emitted by the star.
Also called radial velocity.
Compare redshift, tangential motion.
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2012.
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Based on the Random House Dictionary, © Random House, Inc. 2012.
Cite This Source
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Radial motion
is always a great word to know.
So is alpha. Does it mean:
| the magnitude of a star as it would appear to a hypothetical observer at a distance of 10 parsecs or 32.6 light-years |
| used to designate the brightest star in a constellation |
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