I find the possibility of life elsewhere in universe highly possible (if can provide a protective magnetic field and possess water-the carbon, hydrogen, nitrogen, oxygen, and phosphate common-and carboniferous meteorites a ready source of building blocks if not. But I don't believe life originated on earth by "abiogenesis" but likely seeded shorty from the small planet that likely crashed into a young earth and formed the moon. I think that planet contained the life seeded to earth. Evidence for life keeps going back further in time, possibly during Hadean period which was hell on earth so not great conditions for life. And molecular clock evidence of genetic code dates it to the earths formation-which predates evidence of life on earth. So the origin of life will remain a mystery. Evolutionary biologist define life from a Last Common Universal Ancestor-which isn't the first life or even address the origin of life-just the last ancestor of alll life of today. The LUCA "is believed" to likely already be a complex organism that eventually gave rise to simpler Archaea and bacteria and then in time more complex eukaryotic cells by gaining the cis-trans Golgi network (that shuffles membranes from plasma membrane to nucleus) and then endosymbiosis of various protobacteria-some photosynthetic ones and an oxidative metabolism one-so forming chloroplast and mitochondria. Crap forgot what I was talking about.
Oh yeah so life possible elsewhere yes and intelligent life-to a degree. To the point of an intelligent life with technology seeking life elsewhere I find the odds of that unlikely. Given the path and time it took with numerous extinction events and climate changes and all the intelligent life forms it took some 4.5 billion years to produce just one seeking life elsewhere with technology. I think Aliens are more likely humans that were genetically altered to be more compatible with space travel- for any really productive space travel to continue humans have to be modified-we just aren't made for long time periods of space travel. All the archaeological evidence seen as alien was our advancements we lost. We already know space travel alters monozygotic twins genetics so obviously even vulnerable at genetic level. Now I think this was likely some time predating written human history-where I think humans may have reached similar pinnacles before but some natural or self-inflicted catastrophe we lost civilizations and digressed-there is evidence of humanity numbers declining to 10,000 or less at least a couple of times. I could see we lose a lot of advancements if the few left were a bunch of dumbasses LOL.Dang I could see that happening again-if the 7.6 billion inhabitants were suddenly randomly eliminated to just 10,000 the odds of us being lost and digressing is highly probable even now. Even if some smart ones survive the dumb ones would eventually kill them because the smart ones have an advantage in competition so if can't beat them with brains beat them with brawn- to death. Explains a lot of written history to.
