How do we know that the universe is infinitely expanding?
In: Physics
We can measure two important things about an astronomical body (star, planet, etc.)
– it’s speed
and
-whether it’s moving toward or away from us
If you measure these aspects of most things (other than those very close to us) we can see that most things in the universe are moving away from us. Since bodies in space don’t change direction on their own, the theory is that everything started at a single point in space and is continually moving outward. We theorize it is expanding because most of what we see is moving further away each year.
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