I took a Solar Systems class last semester. It was a fun class, but it had lots of holes in it. This was somewhat frustrating because I wasn't sure if these gaps were there because it would be too difficult to explain or if they were things we just hadn't figured out yet. As good as the class was, it simply didn't round off at the end.
One of these gaps tortured me so much that I had to ask my professor to explain it to me. The concepts he was talking about just wouldn't fit in my three dimensional brain.
Here's the problem.
According to my professor the universe is not expanding from one point outward, instead, every point in the universe is moving away from every other point at the same exact speed. Do you see the problem with this?
I do.
Let us say that we have 6 points drawn on a line(A B C D E F)
If A and C are moving away from B at the same speed, and D and F are moving away from E at the same rate, then C and D have to move toward each other.
But according to my professor C and D are indeed moving away from each other at the same speed.
Now you see why this doesn't fit in my brain?
I thought about this for weeks. I talked to my teaching assistant and my professor over and over again.
Then it came to me.
Imagine these same points drawn on a balloon. Now we inflate the balloon. Every point on there would indeed move away from every other point.
Since we took a 2 dimensional line and took it to the 3rd dimension, we would need to take the 3 dimensional Universe to the 4th.
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