this post was submitted on 18 Jul 2026
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Dark energy is used to explain the rate of expansion of the observable universe. Dark matter is used to explain observed anomalies in the rotations in some galaxies. For general relativity and Newtonian gravity math to work, there has to be something we can’t observe. Einstein had added a cosmological constant to relativity, that he later called his biggest mistake, but turned out to be very useful.
thanks. i get these things mixed up some