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if there is dark matter every where, why it is noticed near galaxies? why cant we do some very sensitive lab experiments of gravity to find the effect of dark matter?
Because there is more of it near galaxies. Or rather, the galaxies themselves form where the dark matter clumps together under its own gravity, because the gravity of the dark matter causes normal matter to "pool" there as well.if there is dark matter every where, why it is noticed near galaxies?
Because it isn't very dense. Sure, most of the mass of a galaxy is probably in its dark matter halo, but it doesn't appear to clump into dense objects like stars and planets. When you spread out all that mass across the vast amount of empty space available in and around a galaxy the density becomes much too low for one to notice any local gravitational effects that might exist.why cant we do some very sensitive lab experiments of gravity to find the effect of dark matter?