The Celestials are an ancient race of entities that possess vast matter and energy manipulation abilities. They were present long before the dawn of the galactic communities and even the Asgardians. They were notorious for their utilisation of the Infinity Stones.
The Celestials originated at least several million years ago and have used immensely powerful tools to impose their will.
The Celestial known as Ego became aware of its own existence soon after his birth millions of years ago. After several years, Ego realised that he could manipulate molecules and began creating a planet around himself.
After a few millennia, Ego began wondering if there was other life around him. He created a host body for himself and began searching the galaxy before finally finding life.
In his travels throughout the galaxy, he planted seedlings upon thousands of planets, capable of terraforming them into new extensions of himself, but they could only be activated by the power of a second Celestial.
He interacted with other species, impregnating many women in an attempt to create a new Celestial. Ego hired the Ravager Yondu Udonta to collect the children. However, none of the children could access the Celestial power, so Ego killed them.
Ego eventually met and fell in love with Meredith Quill. After Ego had killed Meredith, he paid Yondu Udonta to collect Peter Quill, but Yondu never delivered the boy, discovering what Ego had done to the other children he had delivered.
- Eson the Searcher