Teddy said:
How can you be sure? What if there are other universes outside of our own and they exhibit a pull on ours gravitationally speaking could be the source of dark energy/matter. The earth isn't infinite, the solar system isn't, galaxies aren't. The universe could be a colossal size but not infinite and still expanding up to a point and then may contract back and rebigbang again. Science say they have found 5 of these echos of big bangs happening the the past. Link be somewhere on Google if you search for echos of previous big bangs. Besides many scientists consider infinite speed not possible. C = speed of light fastest possible speed.
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The whole (infinite) Universe I am talking about already contains all others Universes by definition (those that are outside our known Big bang Universe) .
