| 11. | Terrestrial planets are built from heavier elements such as silicon, iron and magnesium.
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| 12. | The inner terrestrial planets consist of Mercury, Venus, Earth, and Mars.
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| 13. | The terrestrial Planet V hypothesis was later examined by Ramon Brasser and Alessandro Morbidelli.
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| 14. | Further collisions and accumulation lead to terrestrial planets or the core of giant planets.
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| 15. | Thus, free hydrogen and helium are now somewhat rare on the terrestrial planets.
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| 16. | Only one terrestrial planet, Earth, is known to have an active hydrosphere.
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| 17. | Kepler-11, known as transited by, in particular, terrestrial planets.
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| 18. | It is the largest out of the four terrestrial planets in mass and diameter.
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| 19. | Some of them are the building blocks that the terrestrial planets were made out of.
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| 20. | Thus the origin of terrestrial planets is now considered to be an almost solved problem.
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