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New evidence suggests that billions of years ago, a star may have passed very close to our solar system. As a result, thousands of smaller celestial bodies in the outer solar system outside Neptune ⁘s orbit were deflected into highly inclined trajectories around the sun. It is possible that some of them were captured by the planets Jupiter and Saturn as moons.
When we think of our solar system, we usually assume that it ends at the outermost known planet, Neptune. ⁘However, several thousand celestial bodies are known to move beyond the orbit of Neptune,⁘ explains Susanne Pfalzner, astrophysicist at Forschungszentrum J⁘lich.
Such a flyby can even explain the orbits of 2008 KV42 and 2011 KT19 ⁘ the two celestial bodies that move in the opposite direction to the planets.
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