A "heretical" alternative to dark matter is MOND (Modified Newtonian Dynamics), proposed by Mordehai Milgrom. Milgrom suggests that dark matter may not exist; instead, our current laws of gravity might be incorrect at galactic scales. MOND successfully ex

A "heretical" alternative to dark matter is MOND (Modified Newtonian Dynamics), proposed by Mordehai Milgrom. Milgrom suggests that dark matter may not exist; instead, our current laws of gravity might be incorrect at galactic scales. MOND successfully explains galaxy rotation curves without requiring unseen matter, which remains a "worry" for traditional physicists. However, most cosmologists rely on gravitational lensing to map dark matter distribution. A key test is the Bullet Cluster, where two galaxy clusters are merging. Observations suggest mass is separated from visible gas, which initially seemed to refute MOND, though proponents still refine their theories. Future instruments, such as the Extremely Large Telescope in Chile, aim to provide the sensitivity needed to finally confirm the properties of dark matter or prove if modified gravity is the true answer. (5/8)
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