Is the ego responsible for Thano's existence?

Celestials

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The origin and provenance of the Celestials is and remains a mystery, but what is certain is that the Celestials appeared very early in the universe. They originated at least several million years ago and have used immensely powerful tools to get their way. Few people know about these beings, and they don't know much about the Celestials either. One of the few who knows more about the Celestials is the collector Taneleer Tivan. They used the power stone as a means to destroy an entire planet. Knowhere, a colony of mines in space, is actually the severed head of a deceased Celestial. [Guardians of the Galaxy]

The Celestial known as ego became aware of its own existence shortly after its birth millions of years ago. After a few years, Ego realized that he could manipulate molecules and began to create a planet around himself. After a few millennia, Ego began to wonder if there was another life around him. He made himself a host and began searching the galaxy before finally finding life. In his travels across the galaxy, he planted seedlings on thousands of planets that were able to shape them into new extensions of himself, but they could only be activated by the power of a second Celestial. He interacted with other species and made many women pregnant to create a new Celestial. Ego commissioned the Ravager Yondu Udonta to fetch the children. However, none of the children could gain access to the power of the Celestials, so Ego killed each of his children.

More on the template in Marvel Comics
The Celestials are powerful extraterrestrial cosmic beings. This alien race influenced key events in human history for mysterious and unclear reasons. They were responsible for important evolutionary events in humans, such as the genetic derivation of the Eternals and Deviants as well as the emergence of inhumans and the development of the X gene. [read more]

Ego also met Meredith Quill and fell in love with her. After Ego killed Meredith, he paid Yondu Udonta to help Peter Quill

Ego with his son Peter Quill.

but Yondu never turned the boy over and discovered what Ego had done to the other children he had freed. Ego has since searched for his son to see if he had inherited the Celestial gene. [Guardians of the Galaxy Vol. 2]

Characteristic features

The Celestials are older than the Aesir and probably older than the Dark Elves, but appear to be human-like in nature. They have bodies that contain similar skeletal and neurological elements that humans have - but on a much larger scale. Ego's biology appears to be unique to that of a traditional humanoid celestial in that it is essentially just one big brain of immense cosmic power that routinely manipulates the molecules around itself to be both the only vulnerable and physical component of its biology (being Brain) as well as mimicking a humanoid form (or presumably any other alien form that best suits his manipulative tactics).

Eson the seeker with the power stone.

Most of what anyone else has seen of a celestial is severed extremities and footage of the collector showing Eson the viewfinder with the power stone. However, it should be known to the galaxy by now that there are actually still living Celestials, as Ego, a planetary-based Celestial, tried to turn many planets across the universe into its extensions, resulting in a major battle with the Guardians of the Galaxy led. The cosmic forces of egos enabled him to manipulate matter and energy at will and to a very extraordinary extent. Ego is also biologically immortal and invincible as long as the "light of its planet" was alive.

As the collector explained, their physical constitution is so immeasurably strong that they can control the Infinity Stones. Celestials primarily exert the ability to manipulate and create matter at the molecular level, an ability that ego used to create a host body for itself. There is only one known Celestial hybrid, Peter Quill, who has shown the ability to draw strength from the essence of his parents in order to manipulate matter and energy. Peter Quill was also immortal and could also touch the power stone. However, Peter Quill's powers and immortality seem to have disappeared when he killed his father ego.

Although another Celestial can be created through sexual reproduction, they are extremely rare. The Celestial Ego fathered numerous children in hopes of creating another Celestial, but only Peter showed any evidence that he had inherited the genetics necessary to make a Celestial.

Well-known Celestial hybrids

Trivia

  • In the comics, the Celestials were deeply involved in the early evolution of mankind and were responsible for creating the Xartans, Deviants, Eternals, and the mutated X-Gene.