Scientists have made a significant breakthrough in understanding the origin of Earth’s water. While 71% of our planet’s surface is covered in water, the question of where it came from has puzzled scientists for years. Previous theories suggested that water arrived on asteroids or was produced by Earth itself. However, new research from the California Institute of Technology reveals that Earth formed from dry, rocky building blocks, indicating that its water arrived late in the planet’s formation. The study suggests that a major addition of water occurred during the last 15% or less of Earth’s formation. By examining the magmas that flow deep within Earth’s interior, scientists can gain insights into the planet’s formation. The team found that while volatiles, including water, were scarce in the deep layers, the upper mantle was abundant in these chemicals. This suggests that Earth formed from hot, dry, rocky materials and water came later. The findings have implications for understanding how terrestrial planets in our solar system formed. Dr. Francois Tissot, who led the study, emphasizes the importance of exploring not only the outer planets but also the inner solar system to better understand the formation of planets like Earth.
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