Sam5 wrote:
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There are different kinds of explosions. An atomic bomb explosion tends to send out a “bubble” or a “thin shell” of a shock wave. But there is another kind that is like an explosion in a pile of dirt or sand. That kind sends out particles in all directions, with the central stuff not moving too much at all and the outer stuff moving the fastest.
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The second kind of explosion only occurs when there’s a force, such as friction or gravity, which slows some of the central material. I don’t see how you could get that in space.
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If the “explosion” was really uniform and the universe bigger than we think, then we would see what we see, but we wouldn’t have to be near the center at all.
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But if that were the case, we could approximate the LARGE spherical surface of the explosion with a tangent plane, and upon that plane all the galaxies would be moving away from the center of the sphere at roughly the same velocity, and have little or no recessional velocity with respect to each other. In other words, the observed redshifts of galaxies would depend strongly on their position within the sphere of the heavens. If the center of the explosion happened to be located in the direction of the line through the NS poles of the earth, then galaxies along the equator would show little redshift, with more northern or southern galaxies exhibiting a larger redshift as a function of distance. That’s not the case.