Missing planets twice Earth’s size may point to migrating worlds

Supercomputer simulations have provided an explanation as to 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 plot on a graph how many planets of each size astronomers have discovered, you’d find two peaks: one at 1.4 times Earth‘s radius, and another at 2.4 times Earth’s radius. Between them is a dip or valley, at around 1.8 times the radius of Earth, signifying the relative scarcity of planets of that size.

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