New discovery forces scientists to rethink how Earth formed
It is believed that water-rich material from beyond Jupiter played a major role in Earth formation
A new research study has challenged what scientists think about Earth’s origin and how it came into existence.
For years, the origin of raw material responsible for Earth formation has been a contentious issue. Scientists believed that 6-40 percent of its building material arrived from the outer Solar System, beyond Jupiter.
Now a new discovery is challenging this theory. A new study conducted by ETH Zurich researchers, Planetary scientists Paolo Sossi and Dan Bower, reveals that Earth’s building material came entirely from the inner Solar system, accounting for less than 2 percent and potentially 0 percent from the outer Solar system.
Calculations based on ten different isotope systems show Earth formed from a single local reservoir, shifting away from the long-held belief that 6% to 40% of Earth's material came from beyond Jupiter.
"Our calculations make it clear: the building material of the Earth originates from a single material reservoir," says Sossi.
Bower adds, "We were truly astonished to find that the Earth is composed entirely of material from the inner Solar System distinct from any combination of existing meteorites."
As per new analysis, Earth is entirely made from non-carbonaceous material. These findings also indicate the progression of Earth in a stable environment by incorporating smaller planetary bodies occurring nearby. It also suggests that substances like water may have existed in the inner part.
The findings suggest that Jupiter acted as an effective gravitational barrier, preventing outer Solar System materials from mixing into the inner region. And Earth during formation took very little material coming from Jupiter.
"Our calculations are very robust and rely solely on the data itself, not on physical assumptions, as these are not yet fully understood," Bower emphasizes.
The results also show that Earth's material composition resembles that of Mars and Vesta.
With outer-system delivery ruled out, scientists face a fresh question: how enough water-rich volatiles existed in the hot inner Solar System to eventually fill Earth's oceans.
"Until then, however, Dan and I will have to engage in many heated debates about the material composition of Earth and its neighbouring planets, because the scientific discourse over the building blocks of Earth is far from over, despite the new findings," Sossi added.
