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Missing planets twice the size of Earth could indicate migrating worlds

Supercomputer simulations have provided an explanation for why so many exoplanets are either super-Earths or mini-Neptunes, with few planets in between.

exoplanets can come in a variety of sizes and masses. If you were to graph how many planets of each size astronomers have discovered, you would find two peaks: one at 1.4x Earth‘s radius and another at 2.4 times the Earth’s radius. In between is a depression or valley about 1.8 times Earth’s radius, indicating the relative scarcity of planets this size.

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