Dark Energy is another mysterious element of our mysterious universe, its composition is still unknown to us

Dark Energy is responsible for our Accelerating Universe though its composition is still a mystery

Dark energy is a mysterious energy. Scientists' don't know much about it. It is a negative force because it pushes galaxies away from each other. When our universe was young gravity was dominant force. So galaxies and stars were born. But as our universe continues to expand; dark energy seems to dominate. The result is our Accelerating Universe.