In the early 1900s, astronomers noticed that the light waves coming from
other galaxies were expanding and that the frequency of the light waves was decreasing (the light waves were being stretched out). What does that mean
about the movement of galaxies in the Universe?

this means that the movement of the galaxies in the universe are stretching and are getting bigger and the frequency of the light waves are decreasing because the wider something gets like galaxies and stuff like that that gives off light are stretching so it will become dimer because it is trying to stretch to wider surroundings and that means the light has to stretch to so the light has to cover bigger surfaces and the light can not get brighter so it has to stretch and dim its light.

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In the early 1900s, astronomers noticed that the light waves coming from other galaxies were expanding and that the frequency of the light waves was decreasing (the light waves were being stretched out). What does that mean about the movement of galaxies in the Universe?

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In the early 1900s, astronomers noticed that the light waves coming from
other galaxies were expanding and that the frequency of the light waves was decreasing (the light waves were being stretched out). What does that mean
about the movement of galaxies in the Universe?