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Breadcrumb Home Press Area April 23, 2020 Although some interstellar bodies only pass through, others remain and orbit the sun. This is the case for 19 asteroids that gravitate between Jupiter and Neptune. According to the two scientists’ calculations, their current orbits and characteristics can only be explained if these objects were not in our solar system at its birth, 4.5 billion years ago.
The Solar System formed in a disk of gas and dust whose constituents revolved around the Sun in the same direction. In the final stages of planetary formation, trillions of bodies were expelled beyond the reach of the planets, forming a relatively thin disk of debris. The Galaxy's tidal forces then modified this structure into a spherical shell known as the Oort cloud that remains gravitationally bound to the Sun.
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