Nuclear is taboo, but a mass moving at high velocity in space and then impacting the Earth is just as powerful, if not more so. Seeing it launch, and knowing it is coming but unstoppable except through leveraged diplomacy is more strategic. The timeline is long, but the potential for a redistribution of geopolitical power structures is large.

I think it is likely a distant future type of problem. Refueling of a large craft in space is likely a major factor, but we are nearly at that point now. I am curious if such a technology comes before large scale space colonies or after. Does it make more sense to weaponize some low earth orbit asteroid for the mass, like covering the surface with an expanding ablative resin before redirecting it to a target.

If all major wars last for years, when (if ever) does it make sense to have a launch platform around a Jovian moon for the largest gravitational assist.

Not that I want any such thing. I am thinking about hard science fiction and the overall timeline.

For example how come I can be playing a video game and it seems to me time as sped up? Or how about someone in prison or jail and it appears to them that time has slowed? And other. Both groups know its not as speed up or down but just seems that way? Why is this?

I've seen this video where GOOGOL gear is depicted (it takes 10^100^ years on reaching the final gear) but how many generations will it take? The 5th gear takes about 10 hours in real time, by the time the 10th one starts spinning (you're probably already dead).

The entire thing consists of 100 gears. However, even if you record or livestream a video of the entire thing: would you still be alive by the time the final gear starts spinning? The common life span of a human is around 72-73 median but some can reach 100+ up to 125.

Maybe it’s just been the “apple barrel” cheap brand, but it seems that the lighter green varieties turn into a completely thin green liquid after a few years that smells vaguely like an alcohol/“chemical-ly.”

It’s specifically the greens that do this, so I’m wondering if there’s something in the green pigment that reacts with the binder after time. Most other cheap acrylics tend to dry out - reds more so. Is there some sort of slow chemical reaction happening with the greens instead?

Edit: I found a bottle of Orange just now that went off in the same way. Apple Barrel, matte, “Pumpkin Orange” 2047E.

It’s just a very striking way for paint to degrade. Drying out or just have the binder separate I get, but this one has to be involving some sort of fun chemistry.

So in the long run, all that we have built will build and thought of building will pretty much be worthless since we have would cease to exist?

Ok getting some real sciency answers which proves you are way better than I am. Can you guys and gals break some of it down like I am 5 or so?

Hi, i'm looking for a FOSS or at least free and offline way to simulate electromagnetic fields in interaction with moving objects and electrical circuits.

(If it runs on linux, even better)

Thanks for any help :)

Okay, I know it sounds weird, but hear me out:

We know space is expanding, sure. That's been established science for a while now. All three spatial dimensions at the same (increasing) rate.

So ... why should we assume that the 4th dimension -- time -- is static and unchanging like we used to think space was? Could time also be expanding or contracting? (Expanding seems more likely, as it would match what the other dimensions are doing.) After all, spacetime is all one thing, really. Space and time are inextricably linked. When you think of it that way, it seems nearly impossible that space would be expanding while time is not. Spacetime is expanding, so wouldn't that include time as well?

My question here is: what would it look like, subjectively, from our perspective inside it, if time was expanding just like space? Would we be able to measure it at all? Would there be any difference? Could the acceleration of space expansion ('dark energy') actually be explained by time expansion instead?

For a moment, imagine a universe where time definitely is expanding. Even if you don't think time could really be expanding, let's think about that hypothetical universe where it definitely is. What would that universe be like? How would it be different -- if at all -- from our universe?

Does it even matter? If time is expanding, but we still experience it passing at a constant rate, why would we even care whether it's expanding or not? An observer somehow watching it happen from 'outside of time' might, say, see things happening slower and slower ... but for beings living inside of spacetime, with their subjective perceptions also dependent upon the flow of time, would it actually change anything at all?

I had a random idea pop in my head while watching a video describing the relationship between radiation's energy density and entropy. And I'd like to run it past some people who have a deeper understanding of physics than I.

What if dark matter follows an inverted curve? What if we can't see it because while energetic it emits less radiation and then will become brighter and hotter as it loses energy? Perhaps it even has reversed entropy too and becomes more energetic over time.

This might be crazy, but dark matter is pretty crazy itself. Am I completely off base, or could that line up with any real theories? Maybe it could work with antimatter instead of dark matter?

Worst case I'm just curious and wrong, best case I inspire someone to discover something new. Thanks

This has always haunted me. Any questions or want me to explain further I will. Thanks in advance for all that reply.

Even though its my property?

On a scale from pseudoscience to Hard Science how seriously is Quantum Immortality taken by people who Quantum for a living?

Was mainly wondering because I see it being promoted by things like Kurzesgtat (I know I butchered that) and other popular Science promoters.

Yet anytime I see anyone, even Roger Penrose himself, supposit that mind is any way connected to Quantum phenomenon it is attacked mercilessly and rushed out of the room like a crazed bloodied up goat that somehow snuck into a nursery.

So I am a little confused. By what mechanism would Quantum Immortality even work if science is so sure there is nothing like a soul jumping timelines?