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Surely a stupid argument. The early earth was likely "oxygen" starved too. We have an abundance on earth because plants need Hydrogen and plants pay a high ene
by robocat 3y ago
Surely a stupid argument.
The early earth was likely "oxygen" starved too. We have an abundance on earth because plants need Hydrogen and plants pay a high energy price to get it from water and then plants discard the O2.
Europa has water therefore it has oxygen too. Whether there is enough available energy is a different question.
- coffeebeqn 3y agoOxygen is toxic stuff until you evolve to use it. Just look at what it does to iron
- w-ll 3y agoThis is my biggest complaint with the Phyrexian plane.
- xandrius 3y agoSome say that rust is what they get their energy from.
- yawgmoth 3y agoWe are ineffable! Dominaria will fall. ( edit: hope folks will appreciate the username ;) )
- giantrobot 3y agoYou've been playing the long game.
- throwaway743 3y ago... please don't say you play Sheoldred
- pelagicAustral 3y agoI just want to say that in case anybody plays with Warlock II on DotPW (Manalink), if you add 1 Elesh Norn, 1 Grisselbrand instead of Living Wish, the deck becomes too lethal to even exist.
- nurettin 3y agoI remember when type 1 was called type 1. And kids discarding zero mana artifacts as useless.
- fbdab103 3y agoAlso known as the Great Oxidation Event[0]. Although the event is inferred to have constituted a mass extinction,[7] due in part to the great difficulty in surveying microscopic organisms' abundances, and in part to the extreme age of fossil remains from that time, the Great Oxidation Event is typically not counted among conventional lists of "great extinctions", which are implicitly limited to the Phanerozoic eon. In any case, isotope geochemistry data from sulfate minerals have been interpreted to indicate a decrease in the size of the biosphere of >80% associated with changes in nutrient supplies at the end of the GOE. [0] https://en.wikipedia.org/wiki/Great_Oxidation_Event https://en.wikipedia.org/wiki/Great_Oxidation_Event
- davidwritesbugs 3y agoIndeed. 70-ish years of exposure will kill you dead.
- skywal_l 3y agoWell good thing it oxydates iron or we woudn't be able to move it in our body!
- HPsquared 3y agoCurrently imagining myself as some hideous beast that breathes the well-known toxic corrosive gas "oxygen". Makes you think of the sulphur dioxide in Venus' atmosphere, and whether life could still evolve in those conditions.
- cpfohl 3y agoThis was the exact premise of Battlefield Earth. The invasion aliens couldn’t believed we needed oxygen
- stouset 3y agoTo be fair, plants had ample sunlight to use for energy to break apart carbon dioxide. Undersea European life would need some other source of input energy.
- scheme271 3y agoChemosynthesis is something that's been observed where deep sea worms use hydrogen sulfide to convert co2 and o2 into sugars. It's possible that there are other chemical pathways that can be used where the o2 isn't used at all.
- RajT88 3y agoI am not a chemist, but Crucian Carp manage some chemical trick to convert food into oxygen (the reverse of what you're saying): https://www.sciencedaily.com/releases/2006/08/060825103548.htm https://www.sciencedaily.com/releases/2006/08/060825103548.h... (Truth be told, Carp in general are so resistant to winter, I wonder if most carps have this trait in some amount)
- interestica 3y agoWait wait, Will European Life be the preferred term?
- mvkel 3y agothought to be habitable [to humans]. Early earth wouldn't have been habitable to humans either.
- BryanLegend 3y agoYeah, oxygen is surely the more exotic part of water. The hydrogen is far more common.
- Chris2048 3y agoDepends what you mean by common. In the universe, and outer planets, yes. But the hotter (and smaller) inner planets have a hard time of keeping hold of lighter elements, so it's much rarer and only really available when bound to heavier compounds such as water.
- coldtea 3y ago>The early earth was likely "oxygen" starved too We'll just wait a couple billion years then! Problem solved.
- AlecSchueler 3y agoI think the point that, even without oxygen, it could already be habitable for anaerobic organisms.
- coldtea 3y agoWell, it does say: "“We don’t really know how much oxygen you need to make life,” she said. “So the fact that it’s lower than some earlier, wishful-thinking estimates is not such a problem.”.
- rad_gruchalski 3y agoHeh, the problem is we only have 800, maybe 900 million years left!
- nikanj 3y agoThe tidal forces from Jupiter dump a boatload of energy into the system, not sure how usable those are for life
- lemaitre 3y agoIf there is life on any of the gas giant moons (particularly Europa and Enceladus) it's tidal heating that sustains it. There are basically four ways a planet can be heated: 1. Latent heat of formation. As the planet forms, denser materials sink down to the core and lighter materials float up to the top. This releases their gravitational potential, heating the planet. Over time though, this heat radiates into space. Icy moons are too old for this to be enough heat to support a liquid ocean. 2. Radioisotope decay. Particularly stuff like Potassium, on long time scales, decays and releases heat energy. This is a significant source of heating on Earth. Less significant on a small moon since radioactive isotopes are pretty rare, all things considered. 3. Solar heating. Sun hot. Planet kinda hot. 4. Tidal heating. The planet gets physically flexed by interacting orbital resonances between another moon and the host planet. This can be powerful enough to drive large amounts of volcanic activity on the surface of Io. Europa Clipper is a mission that will fly high-precision magnetometers over Europa relatively soon (by NASA standards). It's possible that those magnetometers could pick up on induced magnetic fields from the interaction of charged salt ions moving in Europa's ocean with the magnetic field of Jupiter. If that signal can be detected, it may be possible to map the sub-surface ocean and start to do some sort of astro-oceanography.
- deleted 3y ago[deleted]