A mysterious form of energy that permeates all of space and is responsible for the accelerating expansion of the universe. It comprises approximately 68% of the total energy density of the universe but its nature remains unknown.
The term was coined in the late 1990s following the discovery that the universe's expansion is accelerating. 'Dark' indicates it doesn't interact electromagnetically, while 'energy' reflects its role in driving cosmic dynamics through negative pressure.
Try Another Word