Astrophysicist all over the country rejoiced as they once again proved that Einstein was wrong.
Dark energy is a concept first cast by Einstein in his Theory Of General relativity, but then discarded it later and called it as his greatest blunder.
Team led by Dr Chris Blake of Swinburne University surveyed 200,000 galaxies and showed that it is dark energy indeed which is responsible for universe to expand. 26 scientist of Wigglez Dark Energy Survey using Anglo-Australian telescope mapped distribution of energy over the volume of universe.
Dark energy is an energy which is responsible for universe to expand at accelerating rate. It has extremely low density and hence it cannot be detected in laboratory.
Here are some links to know more about expanding universe