Dark energy
a theoretical form of energy postulated to act in opposition to gravity and to occupy the entire universe, accounting for most of the energy in it and causing its expansion to accelerate.
Usage:
Dark energy is a external force other than gravity.gravity is a purpose of giving gravity to planets likewise the dark energy is the external force which will made every planet orbit in a gravitational path and also it will handle stars in the Galaxy by without get out if it.By this we may understand that dark energy is much powerful than gravity and similar to black hole ..
By nasa,the if a light travels to the universe from Galaxy it will able to blur in particular place that place they identified dark matter by Hubble's telescope but it is invisible..This led to find many new galaxies.Many of the ancient spiritual books are given statement about the dark matter in various name
Evidence:
At first many of the scientist are not accepting this after many experiments it will be acceptable..Sir.albert Einstein and many famous scientists are worked in this part.. Currently nada divided few group of scientist across all their stations to monitor and research about dark energy
