Colourful Change in Spectrum of a Celestial Body
Puzzle 9 of Astrology Medium Pack
Question is: Colourful Change in Spectrum of a Celestial Body
and the answer is: REDSHIFT
Word Meaning:
REDSHIFT — (physics: astronomy, relativity) An increase in the wavelength of a photon or of light, corresponding to a lower frequency and a shift toward the red end of the electromagnetic spectrum.
Definitions from Wiktionary.