About: Alien planets

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About: Alien planets Sponge Permalink

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Though there are speculation about life on gas giants, as far as we know a solid crust is necessary to the complex chemical interaction needed by life, and as a long-term storage of chemicals. It's still unclear what factors create a solid (terrestrial) rather than a gaseous (jovian) planet - since terrestrial planets in the Solar System are the closest to the Sun, it was assumed that planets with higher mass were naturally pushed away by their star, but now a number of planets are known to be both gaseous and very close to the star.

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rdfs:label	Alien planets
rdfs:comment	Though there are speculation about life on gas giants, as far as we know a solid crust is necessary to the complex chemical interaction needed by life, and as a long-term storage of chemicals. It's still unclear what factors create a solid (terrestrial) rather than a gaseous (jovian) planet - since terrestrial planets in the Solar System are the closest to the Sun, it was assumed that planets with higher mass were naturally pushed away by their star, but now a number of planets are known to be both gaseous and very close to the star.
dcterms:subject	Exobiology Exobiology Planets Planets Tutorial Tutorial
abstract	Though there are speculation about life on gas giants, as far as we know a solid crust is necessary to the complex chemical interaction needed by life, and as a long-term storage of chemicals. It's still unclear what factors create a solid (terrestrial) rather than a gaseous (jovian) planet - since terrestrial planets in the Solar System are the closest to the Sun, it was assumed that planets with higher mass were naturally pushed away by their star, but now a number of planets are known to be both gaseous and very close to the star. As a general rule, bigger terrestrial planets will have a stronger tectonic activity: for the square-cube law, a bigger planet has a smaller surface relatively to its volume, and therefore leaks away less internal heat. It should have a large molten core rich in metals and radioactive elements (which release more heat), a thick mantle and a thin, brittle crust that is easily cracked by mantle convection. In fact, Earth as a strong tectonic activity, as probably does Venus, while far smaller Mars and Mercury have none (though there are old volcanoes that witness a past activity). A large presence of water in the crust also contributes to tectonic activity, lubricating plates and making rocks more pliable.

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