Missing planets twice the size of Earth may indicate migratory worlds

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

outer planets They can come in a variety of sizes and masses. If you were to plot on a graph the number of planets that astronomers have discovered of each size, you would find two peaks: one at 1.4 times a landAnd another radius of 2.4 times the radius of the Earth. Between them is a cliff or valley, the radius of which is about 1.8 times that of Earth, which indicates the relative rarity of planets of this size.

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