In Guardians of the Galaxy, Vol. 2,
Ego says that.
much of his power comes from the light within his planet.
Ego also explains that
Ego created the planet out of cosmic stuff as a part of what was becoming his expanding self.
Ego also explains that.
Ego has planted seeds all across the Galaxy that will enable his creation to envelope the entire Galaxy. The seed that we see on Earth lools like light.
But Ego needs
another Celestial in order to control the light enough to make the seeds grow to envelope the Galaxy.
In fact, Ego went to great lengths to
Create someone with the Celestial genes required for the task.
So what is the light within Ego's planet? And what is it about the Celestial genes that enable someone who has the Celestial genes to manipulate the light?