Ummm… Only thing we’re sure of is that those gravitational effects exist. Dark matter and dark energy are theorized to explain the real gravitational effects that we don’t understand. We don’t “know of their existence,” there are other theories to explain the gravitational effects.
Ummm… Only thing we’re sure of is that those gravitational effects exist. Dark matter and dark energy are theorized to explain the real gravitational effects that we don’t understand. We don’t “know of their existence,” there are other theories to explain the gravitational effects.