Right here’s the factor: the outer areas of galaxies in our universe rotate on the identical pace nearer to the middle, which contradicts Newtonian mechanics wherein the rotational pace ought to lower with distance from the middle as a consequence of lesser gravitational pull.
Nonetheless, that doesn’t occur, and all the things rotates on the identical pace, suggesting that there’s extra, unseen mass that gives the required gravitational pull that maintains pace. Thus, scientists have provide you with the idea of darkish matter, they usually’re now making an attempt to verify utilizing of black holes.