The presence of dark energy has been deduced by studying the movement of stars and galaxies.
Around the 1990's, astronomers studying the rate of expansion of the universe discovered something abnormal. Instead of slowing down due to gravity or even remaining the same, the universe was expanding at an alarming rate.
The rate of expansion was measured using the light coming from supernovae ( massive exploding stars ). While puzzled by this idea, some scientists brought up an old idea by Albert Einstein, also called his "biggest blunder", that there is an energy contained in the vacuum of space that is repulsive and is accelerating the expansion of the universe. This mysterious energy is what is known as dark energy today.
Dark energy, most at times is confused with dark matter. Very little is known about it as of today, as it is invisible because it doesn't react to visible light. The presence of dark energy is therefore studied by monitoring its gravitational pull on distant stars and galaxies.
To learn more about dark energy, visit;
https://brainly.com/question/24197345
#SPJ4