It's amazing to realise that all the matter in the Universe we can see, the planets, stars galaxies etc. is only 4% of the matter in our Universe. The rest is either Dark Matter or Dark Energy.
A scientific theory is a well-substantiated explanation of some aspect of the natural world, based on a body of facts that have been repeatedly confirmed through observation and experiment. Such fact-supported theories are not "guesses" but reliable accounts of the real world.
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