how do scientists confirm things like the universe is expanding rather than contracting?
In: Physics
You know how a fire truck that’s coming towards you is slightly higher pitched than when it’s moving away from you?
Light works the same way. The two ends though, instead of being higher and lower pitched, are blue and red (Atleast from what we can see with your eyes). If light coming towards you/ you are moving toward it, it’ll appear slightly more blue than its true color. Vice Versa, things moving away from you will be slightly shifted red.
When we look out into the universe, almost everything is shifted red no matter which way we look. If everything is moving away from us in all directions the only logical explanation is that the universe is slowly drifting away from you, just like all the women in your life.
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