The dichotomy arises during the first 50 million years of planetary history.
The new simulations support the migration model, and also explain why we frequently find chains of similarly sized exoplanets in what scientists dub near-resonant orbits. Resonance occurs when planets' orbital periods fall into multiples of each other; for example, an outer planet might orbit once for every two orbits of a planet interior to it.
"The migration of young planets towards their host stars creates overcrowding and frequently results in cataclysmic collisions that strip planets of their hydrogen-rich atmospheres," Izidoro said in a
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