News of the WeekAstrophysics

Radical Gravity Theory Hits Large-Scale Snag

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Science  01 Jun 2001:
Vol. 292, Issue 5522, pp. 1629
DOI: 10.1126/science.292.5522.1629a

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For nearly 2 decades, modified Newtonian dynamics (MOND), a heretical theory that alters some properties of gravity to eliminate the need for dark matter, has survived one astronomical observation after another--and even gained strength in the process. But now, physicists at the Institute for Advanced Study in Princeton, New Jersey, have shown that the theory is deeply at odds with observations of galaxy clusters, suggesting that MOND is in trouble.