There are a lot of speculations about the appearance of dark energy mainly because it has always been a wonder how the solar system is able to stay in its place. There are a lot of astronomers who believe that dark matter does exist. Dark energy is different from light energy in the senses that dark energy can pull different objects towards it.
This is an idea that has been explored countless times. There are also some reports of it but none of the reports are too detailed to give relevant and vital information. Dark matter is not the same with dark energy but dark matter is known to exist in 70% of space.