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Earth and Space Sciences · 术语表

什么是 Mass–radius relation？

又称： mass--radius relation

Definition 28.15 University Earth and Space Sciences — Year 3 · 第 28 章 — Exoplanets

The mass–radius relation of a composition is the radius of a planet of that composition as a function of its mass, computed from the equations of state of its materials in hydrostatic equilibrium; a measured planet is compared with the relations of candidate compositions.

Mass and radius of 1078 transiting planets whose mass is measured to better than 25\,\% and radius to better than 10\,\% (grey; NASA Exoplanet Archive, 23 October 2026), with model curves of L. Zeng and others (2016, 2019): pure iron; Earth-like rock, a third iron and two thirds silicate; half water on such a core, at 500\, K; an Earth-like core with a hydrogen envelope of 2\,\% of its mass, at 500\, K. Red squares: the Solar System’s planets (Mercury and Mars lie off the scale, to the left). — Mass and radius of 1078 transiting planets whose mass is measured to better than $25\,\%$ and radius to better than $10\,\%$ (grey; NASA Exoplanet Archive, 23 October 2026), with model curves of L. Zeng and others (2016, 2019): pure iron; Earth-like rock, a third iron and two thirds silicate; half water on such a core, at $500\,\mathrm{K}$ ; an Earth-like core with a hydrogen envelope of $2\,\%$ of its mass, at $500\,\mathrm{K}$ . Red squares: the Solar System’s planets (Mercury and Mars lie off the scale, to the left).

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