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It is well known that there is a conflict between Newton's and Einstein's theories of gravity and the behavior of distant galaxies. Either there is more mass in these galaxies than we see, or the pull of gravity is in these conditions stronger than expected. Rather than second-guess Newton, physicists have invented a thing they called 'dark matter', non-luminous matter. Not everyone believes in dark matter, and according to MOND (Modified Newtonian Dynamics), the gravitational attractiondoi:10.6084/m9.figshare.5271448.v13 fatcat:vukhixmelzgbhi4dnhgxkq5kd4