Asteroids are time capsules revealing the solar system's violent birth
In short: The Dawn spacecraft is currently orbiting Vesta, the asteroid belt's second-largest object. By studying these planet-like survivors, scientists are decoding the original building blocks of our solar system, revealing how location and chemistry dictated the destiny of every planet.
To examine the primary mechanisms of early solar system development, NASA initiated the Dawn project in 2007. By visiting Vesta and Ceres—the largest bodies in the main asteroid belt—the spacecraft provided data that telescopes and brief flybys could not capture. These bodies are considered intact survivors from the solar system's earliest history, forming approximately 4.6 billion years ago.
Dawn's findings have forced a revision of planetary migration models. The mission highlighted that a body's 'place of birth' was critical to its evolution. For instance, Vesta likely formed in the inner solar system and remained there, evolving similarly to the rocky planets we see today. In contrast, Ceres appears to have formed in the colder outer solar system, beyond the orbit of Jupiter, before migrating inward. This migration is evidenced by the presence of ammonia on Ceres, a chemical that requires extreme cold to condense.
The spacecraft's mapping of Vesta's craters revealed a surprising amount of large impacts in its northern hemisphere. This suggests that 'planetesimals'—the precursors to planets—were born large rather than being assembled from smaller blocks. Furthermore, Dawn showed that water content is a primary driver of heat. Bodies with high water content, like Ceres, cooled rapidly, while drier bodies like Vesta took longer to cool, eventually melting their interiors to form metallic cores and rocky mantles.
Dawn is scheduled to begin orbiting Vesta on July 16, maintaining an altitude of 9,900 miles above the surface. This proximity allows for a detailed mapping of these ancient worlds, providing a clearer picture of how the early solar system organized itself.
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Sources
- Summary by Intellect · source: Dawn Spacecraft Provides New Data from Asteroid
- Also: Highlights - NASA Science
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