Dark matter is an invisible substance that makes up about 25% of the universe. Dark energy is the force that repels gravity, which makes up about 70%. About 5% of the matter we see today includes stars and galaxies. Since dark matter does not interact with the electromagnetic force, dark matter does not absorb, reflect, or emit light. Dark energy does not have local gravitational effects, but it affects the universe as a whole. The importance of dark matter and dark energy is that they make up the majority of the mass in the universe. Dark matter and energy are important for the functioning and survival of galaxies. Dark matter must contribute to making up 25% of the mass of the universe, because otherwise the elements of the universe would not hold together. This material cannot be observed directly. In the 1950s, studies of other galaxies showed the possibility that there might be other matter invisible to the naked eye. In 2014, a particle physicist named Andreas Hoecker, who works as a deputy coordinator at the European Organization for Nuclear Research, CERN, said that supersymmetry is the best theory they have to prove the existence of dark matter and what it is. Supersymmetric particles are hypothetical particles whose existence was proven after experiments at the Large Hadron Collider. The Large Hadron Collider allows scientists to see dark matter particles. Dark matter particles could disappear but they would leave detectable energy and momentum. Scientists use the missing amount of energy and momentum to infer that dark matter exists. The Large Hadron Collider can also determine the masses and cross sections of dark matter. It is only a possibility that dark matter exists... middle of paper ......ity, a strange energetic fluid that filled space, and that Einstein's theory of gravity could be wrong and that a new theory could be found on cosmic acceleration. Dark energy affects space and time. Dark energy overcomes gravity. In the 1990s, astrophysicists studied distant supernovae to calculate the deceleration of the universe. These astrophysicists were surprised by the results obtained by observing that the universe is accelerating. Hubble's law is the rate of expansion and acceleration of the universe. The results of measurements carried out according to Hubble's law confirm the existence of dark energy and its quantity. Quintessence is the possibility that the universe is filled with a changing energy field. According to Einstein's cosmological constant for a stationary universe, empty space can have its own energy and can increase as more space emerges..