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.
FOR POSTERITY’S SAKE, TAKE THIS WORD OF THE DAY QUIZ!
Are words your bailiwick? Take the latest quiz on the words from July 6 to July 12 to find out.
Question 1 of 7
Also called radial velocity.
Words nearby radial motion
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2020