Ask Ethan: Do binary stars prove modified gravity?
<p>One of the most bizarre and puzzling aspects of nature is <a href="https://bigthink.com/starts-with-a-bang/5-truths-dark-matter/" rel="noopener ugc nofollow" target="_blank">the existence of dark matter</a>: a massive species of particle whose <a href="https://bigthink.com/starts-with-a-bang/5-truths-dark-matter/" rel="noopener ugc nofollow" target="_blank">effects are easily seen</a>, but that has <a href="https://bigthink.com/starts-with-a-bang/xenon-no-dark-matter/" rel="noopener ugc nofollow" target="_blank">eluded every attempt at direct detection</a> thus far. The cosmic need for dark matter is undeniable, although many hold out hope that perhaps a different tactic — adding a modification to the laws of gravity — will lead to an alternative solution that does away with dark matter and supersedes Einstein’s General Relativity all at once. All efforts to modify gravity run into enormous difficulties on cosmic scales, but one specific modification, despite its large-scale cosmic failures, has proven itself more successful than dark matter on galactic scales: MOND, or MOdified Newtonian Dynamics.</p>
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