Researchers Trace Earth’s First Ocean Formation
A new study estimates the planet’s earliest oceans formed within 10,000 years of the global magma ocean solidifying.
Updated on Oct. 20, 2026 in Geology
Earth’s first oceans likely emerged within 10,000 years of the planet’s initial global magma ocean cooling. This process occurred alongside the development of the earliest crust.
Why it matters
Determining how quickly Earth transitioned from a molten state to a water-covered planet provides essential context for the emergence of early life. This timeline helps scientists better understand the geological evolution of terrestrial planets.
Researchers used a heat-budget model to determine that baseline surface cooling to water's critical temperature occurred in 1,800 years. Ocean formation followed this cooling phase within a 2,500-year duration.
The players
University of Science and Technology of China
This is a public research university that conducted the study on planetary formation.
The details
The study, published in National Science Review by the University of Science and Technology of China, utilized a heat-budget model to simulate the condensation of water vapor and carbon dioxide released by cooling magma. This research indicates that oceans formed shortly after the Moon-forming impact solidified the Earth's surface.
Timeline
1,800 years: time required for surface temperatures to reach water's critical temperature.
2,500 years: duration for ocean formation to occur following initial cooling.
10,000 years: estimated timeframe for Earth's first ocean formation after magma solidification.
The Big Picture
This study updates the planetary science research on terrestrial planet formation by providing a heat-budget model to refine the timeline of early development. It offers a new framework that could allow researchers to better understand the evolution of Mars and Venus.
Understanding the timeline of Earth's early water formation provides the foundational data necessary to identify habitable zones on exoplanets. This research helps refine models used to search for signs of life on other celestial bodies.
The takeaway
The study suggests that Earth became a water-rich planet much faster than previously assumed by many geological models. This rapid transition highlights the potential for terrestrial planets to develop stable environments shortly after their initial formation.
Further reading
For more information on the geological history of the planet, explore the Geology section.
