But some scientists think there are 11 dimensions. But none of them can prove their physical existence. They assume that the extra dimensions are theoretically possible since they can be justified mathematically in their string theory in physics. So, there remains the enigma.
https://www.newscientist.com/article/mg23331150-500-cosmic-uncertainty-are-there-really-just-three-dimensions/ https://www.newscientist.com/article/mg23331150-500-cosmic-uncertainty-are-there-really-just-three-dimensions/
