What is Dark energy?

DARK ENERGY

Credits: NASA.gov

Scientists have given the name dark energy because of the property of expansion generating unknown force or substance of the universe. Dark energy is just reverse of gravity. It pushes matter away rather than attracting them together. It is unknown whether the laws of physics or the general theory of relativity accounts for dark energy.

In 1998 astronomers studying supernovae found them dimmer than anticipated. This meant both they were farther away as the universe is expanding faster than expectations . In theoretical it is almost impossible for travelling one galaxy to other. The nature of dark energy about scientists know is very little.

If it is stable , it could continue to expand and accelerate forever. If it is unstable the universe could ultimately will pulled apart like "Big rip". If it has the capacity to change , it could gradually de -accelerate and become an attractive force that contracts the universe like "Big crunch".

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