More distant galaxies show a greater shift of their spectral lines towards longer wavelengths. What does this suggest about the Universe?

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Question

More distant galaxies show a greater shift of their spectral lines towards longer wavelengths. What does this suggest about the Universe?

Accepted Answer

It is expanding — Award 1 mark. The further away a galaxy is, the faster it is moving away, which is what is seen if space itself is stretching. A shrinking Universe would show shifts to shorter wavelengths, every galaxy sees the same pattern so it does not place Earth at the centre, and the speed of light in space is constant.

Answer

Light slows down as it travels

Answer

It is expanding

Answer

Earth is at its centre

Answer

It is shrinking

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