Quote:
Originally Posted by tusenfem
First space-time is 4 dimensional, but it is a mixed thing, 3 spatial dimensions and one temporal dimension. The 3 spatial dimensions are expanding into a 4th spatial dimension.
For the rest, is there any evidence you can show that everything is expanding?
How are you going to solve that problem?
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(See topic B):"Now that we established this new assumption that gravity is not a force, the problem would be how to compromise this idea with what we commonly observe? Assuming, the same man in space is now standing on the surface of the Earth. If gravity is caused by the acceleration of the vehicle and the property of inertia of the rider, it follows then that the ground where the man is standing could also be traveling in an accelerated speed of 9.8 meters per second per second. This would imply that all points on the surface of the earth are moving away from its center, meaning, the Earth is blowing up like a balloon in a tremendous rate of expansion. This therefore, would become a ridiculous idea. No, it isn’t – it has to do with the expanding behavior of the Universe along with a different approach in dealing with the four-dimensional Space-Time."
(See topic C) "In 1922, before Edwin Hubble discovered that galaxies are moving away from us, Alexander Friedmann already made a prediction that the Universe is expanding by giving two simple assumptions. Stephen Hawking even described it by comparing the Universe to a balloon. He said the Universe is like a balloon that being steadily blown up. In its surface are painted spots that represent galaxies. As the balloon expands, the spots would appear getting farther from each other. But one thing Hawking missed to observe - in a real balloon, not only the distances between the spots increases, the spots are also stretching out and would appear bigger. This is the way the Universe expands – everything on it is also getting bigger each seconds of a time.
But why we do not see it that way? Of course, the statement is clear, everything in the Universe are getting bigger including the meter stick that we commonly use in measuring length. If one measured his height a second ago, it would be the same measure of height a second later because the meter stick he used already expanded and continuing to expand in proportion to any thing it measures. Even Einstein claimed that his space-time has the tendency to expand. But to avoid a non-static universe, he introduced an anti-gravity force called cosmological constant. Today, people accepted the fact that the Universe is expanding but could it be that this space-time continuum (as the word continuum suggests an infinite continuation) could be similar to a stretching surface of a balloon that continuing to expand together with everything on it?"
Thank you.