A) Red-shift of spectrum
B) Blue-shift of spectrum
C) Back and forth movement of spectral lines
D) None of the above
Correct Answer: A
Solution :
Option (a) is correct. Explanation: If the spectrum of a star is red or blue shifted, then it can be used to infer its velocity along the line of sight. Edwin Hubble observed that more distant galaxies tended to have more red-shifted spectra. This establishes the theory of expansion of the universe.
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