Question

The Hubble Space Telescope discovered that the light from distant galaxies was being redshifted. Redshift is a phenomenon in which the observed frequency of light is shifted toward the red color spectrum when the source of the light is moving away from the observer. The graph shows the different speeds of galaxies in kilometers per second and their distances from Earth in megaparsecs.



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Which statement does the graph support?


The galaxies farther away from Earth travel the fastest.


The galaxies closer to Earth travel the fastest.


The galaxies farther away from Earth travel at a uniform speed.


The galaxies closer to Earth travel at a uniform speed.

Answer 1

The galaxies farther away from Earth travel the fastest.

Reason: the graph shows a clear positive relationship—recessional velocity increases with distance (Hubble's Law), so more distant galaxies have higher speeds.