THE DOPPLER EFFECT

1 mark · Easy

State what the Doppler effect tells astronomers about distant galaxies.

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It tells astronomers whether a galaxy is moving towards or away from Earth.

Also accept: The direction in which a galaxy is moving relative to Earth.; Whether a galaxy is approaching or receding.

Common mistakes: Simply saying 'about motion' without specifying direction.

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Marking points

B1 · 1 mark · States the Doppler effect indicates whether a galaxy is moving towards or away from Earth.

Worked solution

The Doppler effect tells astronomers if a galaxy is moving towards Earth or away from it.