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Does Dark Matter Really Exist? Or is It a Figment of Our Imagination?
Posted by Guy Pirro on 5/14/2015 6:03 PM
One of the most important scientific discoveries of the 20th century was that the spectacular spiral galaxies, such as our own Milky Way, rotate much faster than expected, powered by an extra invisible gravitational force. For lack of a better term (coupled with a lack of better understanding), this mysterious force was dubbed "Dark Matter." However, dark matter models do not come out naturally and require some disturbing fine-tuning to explain the observations. For this reason, some scientists suggest that rather than being due to dark matter, the faster than expected rotation of galaxies may be due to Newton's law of gravity becoming progressively less accurate at large distances. Remarkably, decades after this alternative theory (a universe without dark matter) was proposed, it still cannot be conclusively ruled out.
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