Answer:
When something in space, like a faraway star or galaxy, moves away from us, its light changes and appears more reddish. This happens because the light waves get stretched out as the object moves away, kind of like how a siren sounds lower as a car drives by. This shift towards red is called redshift, and it helps scientists figure out how fast things are moving in space. We can see this change in the colors of light we receive from the object, and the bigger the shift, the faster the object is moving away from us.
Step-by-step explanation: