Do you ever think about how alien civilizations would have developed

Sure this /r9j/ waifu is cute,
but she must be aware that she has too small tits and broad shoulders to be that cocky in this beach webm

I don't think there is a credible answer to your question, although I might be wrong somebody might be inclined to ponder more science informed sci-fi

How well would life develop on a planet with low oxygen?

>>7998403
I don't know anything about biochemistry. How possible is it that there are biological pathways that require little oxygen? For example I think the earth didn't have much oxygen in the air until photosynthesis evolved.

>>7998403
https://en.wikipedia.org/wiki/Anaerobic_organism

>>7998413
Outside of single celled organisms how viable is it?

>>7998443
https://en.wikipedia.org/wiki/Anaerobic_organism#Multicellularity
I want a microscope.

>>7998403
There would be no fires, kinda useful for certain life forms. Modern trees have often bark that chars and swells in fire as a means for protection. In a low O2 atmosphere (less then 15 percent I believe) tress would not need to expend energy on such protection.

There have been times in Earth's history when there was little oxygen.

The other thing is that life forms would not grow big unless provided with efficient lungs. Insects might not survive low O2 conditions.

My guess: huge plants with large thin leaves and animals that are small with large gills/lungs, slow and careful to preserve energy. Animals might need photosynthesis to get enough oxygen.

>>7998374
Who is this semen demon?

>>7998398
>disliking barely broad shoulders
>being this low tesf

>>7999390
A lot of bigger trees use fires as part of reproduction.

>>7999463
True. And that is by last man standing-principle. Basically it assumes that all other plants die and their seeds are the only ones to survive.

This works if one or a few plants use this principle in an area but if all used it there would be no advantage. And there is a cost to this function.

>>7999500
Grass also uses fire to compete with trees because it can repopulate an area far faster than trees.

What about underwater critters?
Cephalapods have been on Earth for hunreds of millions of years.
They're the smartest invertebrates.
They have hands, of a sort.
But they've (apparently) never developed any technology.

Could some critters living in (lets say) the liquid water or liquid methane oceans on a gas giant moon develop meaningful tech without air for fire?

File: Kepler-22b_System_Diagram.jpg (364KB, 3000x2400px) Image search: [Google]

364KB, 3000x2400px

I've heard that super-earths are supposed to be hypothetically more suitable for life than our planet, because of stuff like how the surface might resolve into shallow oceans dotted with islands that lead to better biodiversity, and the atmosphere would be more protective and so forth.

But I'm not sure how that'd scale to civilization and intelligence. The effect of higher gravity on everything from a creature's gait all the way to spaceflight is up in the air, really.

I'm really interested in extrasolar Earth Analogs.