A student studies data from the Hubble Space Telescope showing that more distant galaxies have greater red-shifts than nearer galaxies.

Which statement correctly explains this observation?

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Question

A student studies data from the Hubble Space Telescope showing that more distant galaxies have greater red-shifts than nearer galaxies.

Which statement correctly explains this observation?

Accepted Answer

More distant galaxies are moving away from Earth at greater speeds — Award 1 mark for linking greater red-shift to greater recession speed. This relationship (Hubble's law) shows that more distant galaxies have greater red-shifts because they are receding faster. A is incorrect — red-shift is not related to the age of light emission. C is incorrect — this 'tired light' hypothesis has been disproved. D is incorrect — red-shift is a Doppler effect, not related to stellar composition.

Answer

More distant galaxies are older and emit redder light

Answer

More distant galaxies contain more red giant stars

Answer

Light from more distant galaxies has lost energy travelling through space

Answer

More distant galaxies are moving away from Earth at greater speeds

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