Dark matter 'proof' called into doubt

 作者:张藁     |      日期:2019-02-26 01:18:02
By Stuart Clark When Douglas Clowe of the University of Arizona in Tucson announced on 21 August that his team had “direct proof of dark matter’s existence”, it seemed the issue had been settled. Now proponents of the so-called modified theories of gravity, who explain the motion of stars and galaxies without resorting to dark matter, have hit back and are suggesting that Clowe’s team has jumped the gun. “One should not draw premature conclusions about the existence of dark matter without a careful analysis of alternative gravity theories,” writes John Moffat, of the University of Waterloo in Ontario, Canada,