Dark matter
The matter is defined as, any object which has mass & volume.Also matter attract each other due to the gravitational force which is the resultant of it's mass(as per the universal law of gravity ).
So,this means that the gravitational force of a body is dependent/proportional/relative to the mass of the body.This is universal & there fore must be applicable to everything in this universe.
But this seem to be wrong in case of some objects like a galactic cluster.The gravitational pull of the object is much more than it need to be when ,this predicts that the excess mass is given by some unseen/hidden/invisible/dark matter which is not responding to any light rays(electromagnetic radiation) which makes it impossible to detect it directly.
Some even suggests the dark matter is the interaction of matter in another dimensions/parallel universes.
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