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terrestrial exoplanet atmospheres compositions

From  meteorite outgassing experiments it was found that outgassing from three carbonaceous chondrite samples consistently produce water -rich (average of ~66%) atmospheres but with substantial amounts of Carbon (II) oxide (~18%) and Carbon (IV) oxide (~15%) as well as smaller quantities of dihydrogen gas and Hydrogen Sulfide (up to 1%). Terrestrial exoplanets likely form initial atmospheres through outgassing during and after accretion, although there is currently no first-principles understanding of how to connect a planet’s bulk composition to its early atmospheric properties. Important insights into this connection can be gained by assaying meteorites, which are representative samples of planetary building blocks .How important is the terrestrial exoplanet life ?

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