Chthonian planet

Rarity: Uncommon

A topic a little better known than average, read and translated beyond its own country.

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What Wikipedia says

Chthonian planets (, sometimes 'cthonian') are a hypothetical class of celestial objects resulting from the stripping away of a gas giant's hydrogen and helium atmosphere and outer layers, which is called hydrodynamic escape. Such atmospheric stripping is a likely result of proximity to a star.

Excerpt from the Wikipedia article “Chthonian planet”, under the CC BY-SA 4.0 license. Read the article on Wikipedia

Image: ESO/L. Calçada, CC BY 4.0, via Wikimedia Commons.