An iron planet is a type of planet that consists primarily of an iron-rich core with little or no mantle. In science fiction – such a planet is also known as a Cannonball.

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A Molten Planet is a type of terrestrial planet, with a surface mostly or entirely covered by molten lava. Molten planets would probably orbit extremely close to their parent star.

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Hot Jupiters are a class of extrasolar planets whose characteristics are similar to Jupiter, but that have high surface temperatures because they orbit very close – between approximately 0.015 and 0.5 astronomical units to their parent stars.

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A hot Neptune is a type of giant planet with a mass similar to that of Uranus or Neptune in an orbit close to its star, normally less than 1 AU.

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A Temperate Planet is a planet with environmental conditions similar to those found on the planet Earth.

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