Water was born as the result of exploding stars
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The formation of water in the universe dates back to just 100 million to 200 million years after the big bang, a discovery that sheds light on the origins of life on Earth and beyond.
During the early stages of the universe, the predominant elements were hydrogen and helium, with only minimal traces of lighter elements like lithium. The absence of heavier elements such as oxygen initially prevented the formation of water.
However, the birth of the first stars marked a crucial turning point. Through nuclear fusion processes, these stars synthesized heavier elements, including oxygen. When these stars reached the end of their lifecycle and exploded as supernovae, they released these elements into the cosmos, enabling the combination of oxygen with pre-existing hydrogen to produce water molecules.
Recent research has demonstrated the plausibility of water molecule formation in the early universe, particularly after the supernova explosions of primordial stars. By conducting computer simulations of the birth and demise of these stars, scientists have gained insights into the timeline and mechanisms behind water creation.
Depending on the size of the stars involved, the amount of oxygen released varied, leading to the production of water in different quantities. Larger stars generated more oxygen and subsequently more water, while smaller stars yielded lesser amounts of water.
The research findings indicate that it took between 3 million and 90 million years post-supernova explosions for water to materialize, placing the emergence of the first water molecules between 100 million and 200 million years after the big bang.
Crucially, the study highlights that the water molecules did not disperse uniformly throughout space. Instead, gravitational forces caused these molecules and other heavy elements to cluster together, laying the groundwork for the formation of subsequent stars and potentially the first planets.
These revelations challenge long-held beliefs regarding the timeline for the emergence of life in the universe. The team of researchers aims to further explore the survival of water vapor amidst the intense conditions during the formation of early galaxies, raising the possibility of the existence of these ancient molecules, even on present-day Earth.
Avi Loeb from Harvard University emphasizes the significance of liquid water for sustaining life as we know it, underscoring the importance of investigating second-generation stars and their planets to unravel the mysteries of habitability in the early universe.
