DARK MATTER
What is dark matter?
Normal matter is that we can see, feel, touch. Normal matter are visible but dark matter is invisible. We cannot see, touch this dark matter. The dark matter exists every where but it is not visible. The only way to measure dark matter is by gravitational force. Actually the cause of formation of galaxies, clusters is dark matter without dark dark matter the formation of these bodies are not possible. For example in a city roads provides transportation of materials for building like cement similarly dark matter is a kind of highway through the normal matter goes into bodies.
