Why bloated exoplanets often dance in perfect rhythm

Sub-Neptune planets that jump in time with the rest of their planetary systems are less dense than those that don’t, planetary scientists have found.

Although conspicuously absent from the solar system, the most common planets in the Milky Way are known as “sub-Neptune,” or worlds between the size of Earth and the ice giant Neptune. It is estimated that between 30% and 50% of Sun-like stars are orbited by at least one sub-Neptune—but despite the ubiquity of these worlds, scientists studying extrasolar planets, or exoplanets, have traditionally had difficulty measuring the density of sub-Neptunes. -Neptune. .

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