Is it possible that Thanos was aware of the birth of Tiamut during the events of Avengers: Infinity War and Avengers: Endgame before snapping his fingers in the movie? Phases 1 through 3 of the Marvel Cinematic Universe, collectively known as the Infinity Saga, revolved around Thanos’s attempt at acquiring all seven infinity stones, as well as the Infinity Gauntlet.
Phase 4 will see the MCU explore new characters, events, and threats after Thanos was defeated in Avengers: Endgame, paving the way for the introduction of new villains, heroes, and villains.
There is a lot of emphasis on the multiverse in Phase 4 of MCU, but there is also time for the introduction of new characters whose stories are unrelated to the multiverse (at least for now). Chloé Zhao’s debut film, Eternals, featured the Eternals for the first time. An alien race known as the Eternals was sent to Earth by the Celestial Arishem in order to protect it from the evil Deviants. The crew remained on Earth for centuries without interfering in human affairs, and as a result, they eventually split up. As the Deviants came back, their leader Ajak was killed, and an apocalyptic event widely recognized as “The Emergence” approached, the Eternals reunited many, many years later.
They also learned about The Emergence, which involved the birth of a Celestial whose seed was sown on Earth and whose literal emergence would lead to Earth’s destruction, from Sersi, the new leader of the Eternals. Eternals who had formed a strong bond with humanity prevented the birth of Tiamut, a Celestial who was expected to be born from Earth; this saved Earth. When the Deviants went rogue, Eternals were created to put a stop to them so that humanity could thrive and Tiamut could emerge from the planet’s required energy, as explained in Eternals. Because of this, the audience is left to wonder if Thanos was aware of Tiamut’s birth when he snapped his fingers.
Having all the Infinity Stones as well as the Infinity Gauntlet, Thanos planned to wipe out half of the universe’s life to restore balance. Because of the overpopulation of Titan, Thanos was inspired to “save” the universe by annihilating half of its population. Despite the fact that Thanos got his way in Avengers: Infinity War, half of the universe was resurrected in Avengers: Endgame, delaying The Emergence because it required a certain number of people and energy to take place.
It’s not explicitly stated in Eternals or any other MCU film if Thanos was aware of The Emergence in Infinity War, but he most likely was. As much as Thanos wished to preserve life in the universe (albeit through dubious means), the Emergence, which meant wiping out entire worlds, went against his wishes. The delay of The Emergence, which would have saved planets and lives, would have made the snap even more important to him.
Marvel needs to address the question of whether or not Thanos knew about The Emergence when he planned the snap and how much he knew about it, given his connection to the Eternals and the impact of the snap in this universe.