system
Given the following post, respond as if you're commenting on Reddit:
human
[GotG2] Spoilers: Regarding Peter's Heritage

Is Ego actually a Celestial? We've seen footage of a Celestial (Eson the Searcher) wielding an infinity stone, as well as the severed head of a dead unnamed Celestial. It makes sense to surmise that Celestials are a race of colossal, immensely powerful humanoids. Where does Ego fit into this? We see his brain, but it's clearly not massive enough to support a booming organic mining operation like the one at Knowhere.
gpt
A. He's got the biggest ego in the universe, claiming to be a Celestial when he's actually leagues below them wouldn't be surprising.

B. He's a baby version of a Celestial, with the adult version looking more like Eson and the Knowhere Celestial. This is similar in the comics on how Celestials reproduce, by placing an embryo at the center of a planet. 

C. The term Celestials is used in the MCU to cover a broad spectrum of powerful cosmic characters. Lesser Celestials include beings like Ego, the Collector, and the Grandmaster. Greater Celestials are like Eson.