The dots on the balloon move apart, when you blow air in it. What causes the universe to do so or to expand?.
It turns out to be dark energy. Scientists know 1 thing about dark energy that they don't know it. Dark energy is 1 of the biggest mysteries, no one can say anything about it. But we know it is causing the universe to expand.
So, if the universe is expanding, it would have started with 0, right? I mean imagine the expansion in reverse. This imagination is what gave rise to The big bang theory (about that in another stash)
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Dark matter, theory of relativity, dark energy, negative mass, end of the universe, The Big Bang, 'What is beyond the universe?' etc. If you love such things, Welcome to your home.'
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Apart from dark matter, the universe is full of energy, most of which is dark energy.
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