Sun Sep 15 10:30:04 UTC 2024: ## Stellar Flyby May Have Reshaped Our Solar System
**New research suggests a star passed incredibly close to our Sun billions of years ago, potentially explaining the strange orbits of certain objects in our Solar System.**
According to two new studies published in Nature Astronomy and The Astrophysical Journal Letters, the stellar flyby occurred within 110 astronomical units (AU) of our Sun – closer than the Voyager 1 probe currently is. This dramatic near-miss, scientists argue, could account for the chaotic orbits of trans-Neptunian objects (TNOs), celestial bodies beyond the reach of Neptune.
Many TNOs have eccentric, tilted orbits, unlike the planets in our solar system. Researchers conducted over 3,000 simulations to test if a passing star could be the cause. The results revealed that a star slightly lighter than our Sun, passing within four times the distance of Neptune, could explain the bizarre orbits of TNOs, including those with retrograde orbits – orbiting opposite to the direction of the planets.
The study also suggests that the encounter could explain the existence of irregular moons, like Saturn’s Phoebe, which orbit their planets in a retrograde and unusually distant manner. The researchers believe these moons could have been TNOs nudged inwards by the passing star and later captured by the giant planets.
This stellar flyby, if confirmed, would represent a significant event in our Solar System’s history. It offers a potential explanation for the perplexing orbital oddities of objects at its outer edges, providing a glimpse into the dynamic and potentially chaotic past of our celestial neighborhood.
First Piper 