Imagine a long straight road with a line of cars travelling along it. The road represents the universe, and the cars represent the galaxies. The road is shrinking in length and width, and so too, are the cars. A ruler running along the edge of the road is also shrinking, so we have no obvious way to measure the relative shrinkage of the road (universe) and cars (galaxies).
Also, the cars are moving further apart from each other while they are travelling and shrinking, so the universe would appear to be expanding from our viewpoint. And some cars are getting bigger than other cars, but they are only getting bigger within this shrinking environment, effectively, they are expanding while they are also shrinking.
One way to explain the paradox of an expanding galaxy within a shrinking universe, is to imagine a picture of two balloons in a frame in the centre of your computer screen. The picture frame represents the universe. One balloon remains at a constant size, while the other is steadily growing. As you are watching the screen, the whole picture gets gradually smaller. One balloon is still growing relative to the other, but the picture frame (universe) and the balloons (galaxies, stars, planets etc.) are all shrinking.
So, while the stars and galaxies travel and drift apart, and while some might grow (and die), they do so within a shrinking universe, in which, they too, are effectively shrinking.
If this theory of a shrinking universe is correct, it has profound implications as to the nature of gravity. It would mean that gravity wasn't the prime cause of matter coming together to eventually create the planets, stars and galaxies. Rather, that gravity is an effect created by the same shrinking force that helped to create the planets, stars and galaxies.
We are midgets compared to what we were yesterday. We are giants compared to what we will be tomorrow.
If we are shrinking at the same rate as the computer screen, who would ever know or care that we are shrinking?
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