The color do galaxies that appear if they are moving toward us is blue. This is because if the wavelength of light is compressed and the light is shifted towards to blue.
What do you mean by Galaxies?
Galaxies may be defined as any of the systems of stars, gas, dust, and interstellar matter that make up the universe.
The phenomenon of shifting the light blue is known as blueshift. This concept of blueshifting arises from Doppler's effect.
Therefore, the color does galaxies that appear if they are moving toward us is blue. This is because if the wavelength of light is compressed and the light is shifted towards to blue.
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