Hubbles Law

Hubble’s Law.
Expanding Universe.
Edwin Powell Hubble.
1889-1953.
Have you ever seen a balloon being blown up? Imagine that the balloon represents the whole universe, and every little dot drawn on it represents a galaxy.
Now, imagine that you're standing on one of those dots, and you notice that all the other dots are moving away from you, just like when you let go of the opening of the balloon and it starts to deflate. This is kind of like what's happening in the universe!
Hubble's law is a way to describe how fast those dots, or galaxies, are moving away from us. It says that the farther away a galaxy is from us, the faster it seems to be moving away.
This is called the galaxy's "recessional velocity," and we can measure it by looking at the color of the light coming from the galaxy.
If the light is shifted towards the red end of the spectrum, it means the galaxy is moving away from us. The faster it's moving away, the more red the light looks.
Hubble's law helps us understand how the universe is expanding, and how fast it's happening. It's like blowing up the universe, and watching all the little dots move farther and farther away from each other as it gets bigger. Let’s not forget about Georges Lemaître’s contribution to this law.