Based on physicists' measurements, most of the mass in the universe is actually taken up by dark matter. Whatever this stuff is, we can see its effects on the behavior of distant galaxies, though no experiment has detected it here on Earth. Doing so probably requires knowing how fast it moves.
Based on physicists' measurements, most of the mass in the universe is actually taken up by dark matter. Whatever this stuff is, we can see its effects on the behavior of distant galaxies, though no experiment has detected it here on Earth. Doing so probably requires knowing how fast it moves.
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