Astronomers have utilized the combined observational power of NASA’s Hubble and James Webb Space Telescopes to conduct the deepest survey to date of Trans-Neptunian Objects (TNOs). These icy, faint bodies orbit the Sun beyond Neptune and serve as remnants of the planet-building process that occurred during the solar system's infancy.
The research, detailed in two papers published in The Astronomical Journal, focused on 27 newly identified TNOs. By analyzing both visible light from Hubble and infrared data from Webb, researchers examined the size, composition, and orbital characteristics of these distant objects. The study categorized the bodies into two groups: "cold" TNOs, which remain in their original, circular orbits, and "hot" TNOs, which were displaced to elliptical orbits during the migration of the outer gas giants.
Contrary to previous scientific models, the findings indicate that small TNOs share the same surface colors and compositions as their larger counterparts. This suggests that these objects have undergone fewer surface-altering collisions than anticipated, effectively preserving their primordial state. "It's really fascinating to see that the smallest objects are somehow 'remembering' and preserving the history of how they were made," noted Anastasia Morgan, a PhD candidate at Northern Arizona University.
The survey also revealed a lower-than-expected number of small TNOs. Despite forming in different regions of the early solar system, both the hot and cold populations exhibited similar size distributions, a result that researchers believe points to a consistent planetesimal formation process regardless of local disk conditions. The smallest object detected in the study measured approximately 3 miles (5 kilometers) in diameter, a level of detail previously unattainable by ground-based observatories.
Source: NASA
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