I don't think much of any life forms have lived for one billion years so for instance, Neanterthals were around for what, 300,000 ish years? Under a million for sure, and how old is Earth? Four or so BILLION years?
Call it THREE billion years for grins. 300,000 times ten, 3 million, so times another thousand you get to 3 billion, 1/10,000ths of the time of Earth even counting it 3 bil.
Humans, around for say 200,000 odd years, so let's go back to 4 bil as age of Earth, maybe it's 4.5 but lets stick with 4 bill for ease of arithmetic.
200,000 years times 20 is 4 million years. So times that by 1000 and humans have been here about 1/20,000ths of the age of Earth.
Not good odds for lasting even ONE million years much less one BILLION years.
That would be preposterous. If we get to interstellar space maybe we could be around in some form a million years from now but not too likely considering so far we can only dream about going close to c and totally in dream world to go even ten times faster than that.
So lets suppose we get a 10 X c thing, even the closest star would be about 5ish months journey and ten ly, one full years journey, 1000 ly? 100 years.
So for a real interstellar civilization, we would need more like 1000c, there we have a 100 LY journey in a couple of months.
1000 LY in a year.
My guess is we would go extinct before we found even THAT kind of velocity so the number of stars we could see in say 1000 years, assuming we could freeze the passengers so they don't need nutrients, toilets and such, and arrive there more or less in one piece as a number of sci fi stories have done, like The book of the long sun by Gene Wolfe, but they are not frozen but a living society evolving on a thousand year journey going something like 1/10 c or so.
That puts us 100 LY away, a lot of stars in THAT sphere though.
At best that would make a bunch of totally isolated civilizations and totally separate evolutionary paths. I guess that would make a nice sci fi story expanding on the Wolfe scenario.
But living only on Earth? good luck.
We can live on Mars and maybe even make a nice Earthy atmosphere but I don't think there is much you can do with what, 1/3 of Earth gravity and that would have to lead to evolutionary changes in X amount of generations, say ten generations and a new species emerges not able to procreate with humans.
The magnetic field now mainly absent on Mars is a technical issue, we can fix that with a few turns around Mars' equator of a superconductor with a few thousand amps flowing and we would have something like a Earthy magnetic field so we would not lose our newly man made atmosphere and the like but we for sure won't be changing that 1/3 gravity thing so we would evolve to adapt to that level of gravity eventually and that would mean those folks would never be able to go back to Earth, which would be 3 times stronger and most likely they would have broken bones and internal damage if they tried to go back to Earth so they wouldn't be fully human any more but a separate humanoid race, see the problems doing the interplanetary colonization thing?
Sure, we could make giant cylinder living spaces kilometers across and say 100 kilometers wide spinning and we live inside that spinning tube and we could go on living as more or less present day humans by having artificial gravity but living long term on planets with 1/3 or 1/6th Earth gravity like the moon, long term there would be evolutionary changes to accommodate such planets or moons.
My guess is say 1000 years of scientific growth meaning we are around for the next 1000 years in more or less the civilizations we have now, like dodging the nuclear war bullet and climate change bullets maybe we could develop some of that technology or even sooner but does anyone here think Germany, US, Russia and such will be around in our present forms 1000 years from now?
More likely EVERYTHING will be unrecognizable 1000 years on, all our present countries dust in the history books.
So we would have a LOT of trouble getting ANY prognostication even ten percent right, meaning 90 percent WRONG.
So it just seems to me we cannot make anything like reliable assertions of human life 1000 years from now and in this present political climate, even what is 100 years ahead.
Look at what life is like now for humans compared to 1923. Good luck with any of folks from that year imagining 300,000 watt laser weapons on ships right now or the internet or cell phones of even computers of most any sort other than mechanical calculators. Imagine US now in 2023 prediction what will be around scientifically or politically in the year 2123.
Anyone have thoughts on those kind of scenarios?