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The other day I thought of how a ground-based explosion causes debris to fly upward, slow, then fall back to the ground. As the explosive force increases, the debris moves higher and takes longer time to fall back to the ground, as described from Newton's famous calculations. However, if the force were very large, the debris would leave the Earth's atmosphere and may pass a point where the sun's gravity overcomes that of the Earth, and that ejected mass then accelerates away from the Earth and towards the solar disk instead of falling back to the ground.
Now scale this idea up to cosmic proportions, substitute the big bang for the ground-based explosion, and stars for debris, then we'd observe the stars accelerating away from the original force instead of slowing and collapsing.
Because this matches what astronomers are observing in our skies, I wonder if one explanation could be there is a mass surrounding the universe that is pulling the stars and galaxies towards it. In other words, instead of a "dark energy" pushing space apart, is it likely our universe is within a massive container whose gravity is pulling space apart?
Taking it further, when will our world crash into the walls of this enormous box? I'm sure this has been talked of before but I've never come across it before.
Due to the study of supernovea in distant galaxies it has been found the the universe is expanding at a greater rate that was thought and this 'force' is called dark energy, although it is not currently known what it is.