Part of Earth's bulk came from asteroids that formed well beyond the Solar System's frost line, according to a new study.
, which scientists think came from asteroids in the outer reaches of the main asteroid belt.
The frost line hasn’t always been in the same place. The Sun pushed the frost line further outward as the Solar System evolved. That’s because initially, the Sun was less energetic than it is now. The solar nebula was also more opaque.because it was the first body to form. But the planets aren’t. Their positions relative to the frost line and types of materials inside and outside of the frost line governed their formation.
An artist’s conception of an asteroid collision in the belt between Mars and Jupiter. Credit: NASA/JPL-Caltech , meaning they had cores and mantles with different compositions. The mantles were rich in water, and the cores were denser. “Ammoniated phyllosilicates form within the water-rich mantles of the differentiated bodies containing NHCCs can come from the dense rocky cores of these asteroids. Since these cores are heavier and more solidified, they’re more likely to be sampled as meteorites.
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