Wild Ideas
11–20 of 166 posts
Re: Wild Ideas
#12Try this: we don't get alien visitors because space travel is prohibitively expensive. But communication is cheap. So you'd expect the sky to be filled with messages, maximally compressed and/or encrypted, and so indistinguishable from noise: background radiation.
It's difficult to intercept line of sight communications and it's unlikely we'd fall on the line of sight of two hot spots of intelligent communication in all the vastness of space.
Even if they broadcast, I doubt it would be so completely uniform in all directions through long periods of time so as to appear as background.
Re: Wild Ideas
#13Re: Wild Ideas
#14Migration to millions of star systems in 10,000 years? Speed of light says NO.
Acceleration, time dilation and deceleration are.
But barring the g-forces and enough of an engine we could travel to Alpha Centauri in less than 4 years, which may surprise you. Although that would be less than 4 spaceship years, not less than 4 Earth years.
Re: Wild Ideas
#15Re: Wild Ideas
#16Migration to millions of star systems in 10,000 years? Speed of light says NO.
This NASA page estimates a star density of 0.120 stars per cubic parsec (CP), where a parsec is 3.26 light years.
http://imagine.gsfc.nasa.gov/docs/ask_astro/answers/980123d....
Thus that page's estimate of the number of stars within a 100 light year radius of Earth is:
= 0.120 stars/CP * 4/3 * π * ((100 LY)/(3.26 parsecs/LY))^3
= around 14,600 stars
Recalculating for 1,000 light year diameter: = 0.120 stars/CP * 4/3 * π * ((1000 LY)/(3.26 parsecs/LY))^3
= around 14.5 million stars
So given 10,000 years, and out-migration by Hansonian 'ems' (mental-simulations) at just 0.2c, and even starting more than a thousand years from now, many tens of millions of stars would be reachable.Of course, there are many other challenges with that prediction, but the speed of light is not an absolute barrier, as you suggest.
Re: Wild Ideas
#17[1]: Einstein, Hawking, and many others have speculated that time travel should be possible, but were ultimately skeptical of it because of the "Where are all of the time travelers?" argument. Fear of the creation of time paradoxes could be the reason why there's no evidence of time travel.
Re: Wild Ideas
#18Migration to millions of star systems in 10,000 years? Speed of light says NO.
Re: Wild Ideas
#192. If medicine were taxed so much that people only bought half as much, they would be just as healthy. False. The "extra" spending in medicine drives innovations so we have better drugs & procedures etc. than we would otherwise.
3. If we keep writing down common sense datums until 2100, we can make computers as smart as people. False.
4. If your head is cryogenically frozen today, you will be alive in 2100. Maybe.
5. By 2100, the vast majority of "people" will be immortal computers running brain simulations. True.
6. There's a five percent chance I live in a "future" computer simulation as I write this. False - to run simulate sentient beings with so much suffering would be cruel.
7. By 2100, world economic growth rates will have increased by over a factor of a hundred. Maybe - progress & growth keep happening faster and faster.
8. The growth of humanity and its descendants will stop forever within a thousand years or so. False - see _The Beginning of Infinity_ by David Deutsch.
9. Our descendants will colonize millions of star systems within ten thousand years or so. True, if we don't fuck up - again, see _The Beginning of Infinity_.
10. The nearest intelligent aliens are many millions of light-years away. True.
11. Billions of years ago, intelligent aliens had a colony near here, but left in a big hurry. False. It's a bad explanation.
12. If we allowed complete freedom of contract, law could be privatized, to our common benefit. Maybe - I don't know about "complete freedom of contract" (can you sell yourself into slavery?) but privatizing law might be a good idea, eventually.
13. If we switched to "futarchy" as a form of government, we would be richer and just as happy. Maybe - if we're going to deviate from tradition, better to do it in the direction of more freedom and less government control - which is known to make people richer.
14. If even a few of us honestly sought truth, we would not disagree with each other. True. For any issue, there is an objective truth of the matter, and if people care enough to find out the truth, they should eventually find a theory/explanation of the issue that no has an issue with, at least for a while. People will keep finding new problems with the latest theory, and they'll have to sort that out, but eventually truth-seeking should lead to plateaus of agreement.
Re: Wild Ideas
#20Soul Extraction - Assuming that there is a technological singularity at some point in the future, and assuming that time travel is possible[1], but that we've seen no evidence of it because it must be mostly observational in nature in order to prevent disruptions that would create time paradoxes, humanity adopts the practice of extracting the brain/nervous systems (and then replacing w/ equivalent matter) of every hu…