DARK MATTER DARK ENERGY

 

1. Dark matter : Dark matter is composed of particles that do not absorb , reflect or emit light so they cannot be observed directly. dark matter produces an attractive force (Gravity) .
2. Dark energy : Dark energy is the name given to the force believed to be making the universe larger. Dark energy produces a repulsive force.
3. As such, dark matter would have been created in the Big Bang together with all other constituting elements of the universe as we see it today.
4. Dark energy is caused by energy inherent to the fabric of space itself, and as the Universe expands, it's the energy density — the energy-per-unit-volume — that remains constant. As a result, a Universe filled with dark energy will see its expansion rate remain constant, rather than drop at all.