For example, the further a galaxy is from us, the more red it is.
In: Planetary Science
Think of it like a moving car. The closer you are to it the louder it is: you can hear the tires, the engine, the exhaust backfire, etc. As the car drives father away the less you hear. At the farthest distance you can hear the car it is just a drone in the distance. (ELIadult The sound wave is busy closer to you but flat farther away)
Light works in the exact same way. The closer you are to something the more complex things you can see, the farther away you are the less you can see. At the extreme side of it the only color we can see is red. Thus, the red galaxies are the ones furthest away. (ELIadult Light works like sounds as a wave: the closer you are the more waves and the more colors you see, but when it is flat the only light is red)
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