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<blockquote data-quote="Turanil" data-source="post: 2958957" data-attributes="member: 9646"><p>First, thanks to everybody for your answers, which are useful. </p><p></p><p>Now about O2, if I understood what I did read (see below), it's not absolutely required to have plant life to produce O2 in the atmosphere. A hot planet with a lot of water evaporation could have enough oxygen in the atmosphere through photodissociation of water vapor. So, let change from cold desert-like planet to hot; maybe this could fit: I will use a sun-like star but older; through time its luminosity-radiance augmented, which led to the planet losing much of its water (that was turned into oxygen). Now the planet orbits around a gas giant, so being close to the inner Habitable Zone edge, it will be hot enough so it doesn't become too cold when behind the gas giant. Also, it will have most of its remaining water on the poles as suggested above. Otherwise, it will have a strong magnetic field, so probably be geologically active (as on Earth).</p></blockquote><p></p>
[QUOTE="Turanil, post: 2958957, member: 9646"] First, thanks to everybody for your answers, which are useful. Now about O2, if I understood what I did read (see below), it's not absolutely required to have plant life to produce O2 in the atmosphere. A hot planet with a lot of water evaporation could have enough oxygen in the atmosphere through photodissociation of water vapor. So, let change from cold desert-like planet to hot; maybe this could fit: I will use a sun-like star but older; through time its luminosity-radiance augmented, which led to the planet losing much of its water (that was turned into oxygen). Now the planet orbits around a gas giant, so being close to the inner Habitable Zone edge, it will be hot enough so it doesn't become too cold when behind the gas giant. Also, it will have most of its remaining water on the poles as suggested above. Otherwise, it will have a strong magnetic field, so probably be geologically active (as on Earth). [/QUOTE]
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