Flat out impossible: Bullet to the moon (Jules Verne). The acceleration would kill anybody, and if it didn't, the capsule would evaporate before leaving the atmosphere.
Actually, no, this is not necessarily impossible. It's impossible with our current technology. You're completely ignoring the development of better means of cushioning acceleration. Who'se to say that we won't develop a future gsuit capable of dispersing the g-forces enough to allow a pilot to survive? So no; not impossible. The same goes for the capsule evaporating... I'm not even sure this is the case with some of our current advanced materials... to say nothing of future materials. If this is something you think of as an actual example of a 'prediction' that's turned out to be 'flat out impossible', then I'm afraid you haven't thought it through very well.
And there's quite a lot of interstellar travel going on in the second half of the 20th century if you look at works from the first half.
That's not an issue with technology prediction but a timeline prediction. Interstellar travel is hardly impossible. In fact, it's not even necessarily impossible with the technology of the 2nd half of the 20th century; there's been a number of interstellar ship designs that could've been built if the political will and money had been there.
I'm not forgetting it. I'm ignoring it because I consider it science-fiction.
Of course it is. ALL technology is science-fiction before it exists. What's your point? Do you even realize how silly you're being? You're throwing up problems that you think would arise from the hypothetical future development of life-extension technologies; but you're not even willing to consider the possibility of *other* hypothetical future technologies being developed that can address those problems. Huh? Wormholes themselves are hardly something that only science fiction authors have talked about, you know. There have been some very eminent physicists who not only predict the existence of wormholes, but that they could be made traversable as well. Wormholes are absolutely a plausible future tech. You can't just wholesale ignore shit.
You can't say "after all" here. "After all" is reserved for referring to a fact we all agree to. I don't.
Nope. The obviousness of a fact is not changed by how many people agree to it. I can, with absolute confidence, say that it is *better* for you to exist in some fashion, than it is for you to not exist at all. Whatever emotional sentiments you have that may lead you to undervalue your own existence to such a degree that you'd reject this doesn't change its basic truth.
It's more productive because we know it's possible.
That's not what being productive is about. If that were the case, we'd have never developed mass production in the first place, and we sure as fuck wouldn't be as productive as we are today. What is and what is not more productive is not determined by whatever some conservative and unimaginative individual 'knows to be possible'; it is determined by the actual end state of your production run. If it *does* turn out immortality or some fascimile of it is possible, then you with your natural life are going to be about as productive compared to the people who take advantage of the new possibility as a medieval peasant is compared to a modern automated factory.
Why? Even though I believe that the best time of my life lies ahead of me (I'm in my thirties), I wouldn't particularly mind dying before Christmas except for the pain it would inflict on those dear to me. 50 more years seems just fine.
Why? The whole reason is because on the one hand, you were making an argument that laments people wanting to take human emotion out of the equation, but on the other hand you're here denying some of the most basic facets of human existence. It is a very human thing to *not* accept the way things are. We see a way to improve on what nature has given us, we fucking take it. It's what's gotten us out of the savannah right to where we are today. To look at the human body and say; "We can do better"; is perhaps one of the most human things we can say about it.
100s of times our current population isn't going to last long on geological timescales if you have a zero death rate and a non-zero birth rate.
...come again? So you have a population that literally can't die, but also can't reproduce... and you imagine they're not going to last long geological timescales? What are they going to do? Die out? Oh wait, they can't.
And, frankly, if I'm to choose between 0/0 and non-0/non-0, I'll take the latter any day of the week.
Thing is, even in the future utopia I'd want to see happen, there wouldn't be a 0/0 split there. There'd certainly be a provision for people like you, who'd want to commit suicide (whether they do it by jumping into a blackhole or just turning off whatever makes them immortal and then living for another 60 years until they die of natural causes). Either way, an equilibrium would still be achieved.
So you're going to die from starvation. What use is "immortality" then?
Who said *I* was going to die of starvation? I wouldn't be the stupid motherfucker who keeps popping out babies even though the food supply is dwindling. Populations stabilize due to lack of food LONG before *every* member of the population actually experiences the starvation.
If I get to pick between dying of old age and dying of starvation after having made senescence a thing of the past, I'll pick the former. And we already live in a world were dying of starvation is unnecessary, and where it can reasonably be made a thing of the past within the century. That's what I mean when I say focus on what's achievable, or "more productive": I prefer a world were nobody dies of hunger or fully preventable infectious diseases to one where "immortals" die from poverty-induced conditions.
Great; so, you think we're smart enough to solve world hunger and infectious diseases... but also somehow dumb enough that when we become immortal (with all the increased time to educate ourselves to degrees impossible now that brings with it too, mind), we somehow lose the ability to
solve these exact same problems.
You may not know this, but the universe (at least the part of it that can be reached from here at sub-lightspeeds) is finite as much as the planet. Exponential growht converges to infinity. Going off planet doesn't solve any problems, at best it staves them off for a few centuries, millenia at best. A blink of the eye if eternity is what you're measuring against.
Which is irrelevant, since you were the one talking about a society with a zero birthrate. Also, this is the exact same argument I've heard on the old forum, and again; was addressed in a number of ways. The worst part of this argument is that it assumes an exponential growth... which is just ridiculous; even if the future immortal race consisted of nothing but inbred retards who can't realize that they should stop growing at that rate, and even if we had all the food we wanted, there are still plenty of other limiters to growth that would prevent it from staying exponantial for long.
Then of course, there's the whole ignoring of things like mind uploads, and given the fact we've already figured out ways to achieve information densities as high as 20 bits nm−2; we wouldn't run out of space anytime soon even assuming no further advances beyond that density.