Astronomers Studying the Light from Calcium Atoms Located in a Galaxy

question 33

Multiple Choice

Astronomers studying the light from calcium atoms located in a galaxy in the constellation Boötes find that the spectral lines are shifted toward the red end of the spectrum. The redshift indicates that the galaxy is moving away at a speed of 3.9 × 10⁶ m/s. What is the distance (in light . years) to the galaxy?

• A)4.7 × 10⁹ light . years
• B)2.3 × 10⁸ light .years
• C)1.1 × 10⁷ light . years
• D)8.4 × 10⁶ light . years
• E)6.6 × 10⁴ light . years

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