a couple of loops with Professor of Physics John Harlander who explained the difference between dark matter and dark energy. The former brings galaxies together by gravitational force, while the latter makes them go apart. Apparently the dark energy is stronger with the result that the universe is expanding and will continue to do so forever resulting in the so-called "heat death" of the universe, that is, it will be cold and dark. Of course by that time the human species will be long gone, extinct as dodos. In fact, the earth will be destroyed when the sun turns into a red giant.
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