What sort of technology do you need to build an FTL drive/ship, and not have to spend eons on a trip getting anywhere close to Earth?
Well, one possibility of FTL travel would be using wormholes or other spacetime anomalies. But before we can even do that, we need an energy source that can produce ridiculous amounts of energy. Current candidates are nuclear and antimatter.
To even stop a wormhole from closing itself because of supergravity you'd need exotic matter which has negative mass and is a purely theoretical thing that nobody has ever seen or detected in any way. These are mostly theories, none of them are possible to implement, just like time travel theories.
I didn't include exotic matter because it is still theoretical. Exotic matter is more or less just a category of matter that physicists use to make their theoretical models work.
INSUFFICIENT DATA FOR MEANINGFUL ANSWER
Joking aside, unless you can figure out a way to tell Einstein to go fuck himself, there is no good way to travel around just our own system without needing to spend 30+ years to do it.
Just going to the neareat star would take about 2,000 generations of humans. (if you traveled around 50,000 Mph.)
This thread is bad and you should feel bad
You arent getting it.
Time dilation only works for the traveler.
If you traveled 3 billion ly to look at and verify a planet can harbor human life, when you returned to tell everyone to pack up, earth would be dead and likely vaporized by our now red giant sun.
Stop being a faggot.
for all the noobs:
1 - time dilation only becomes an issues at 0.7c
2 - nuclear explosions caused by impacting space dust becomes an issues at about 0.2c
so, realistically, dont expect to go past 0.15c
also, just hibernate for the long journies, its not that big of a deal, and so what if everyone you know is dead when you return to earth, theyre all dicks anyway
There are solutions to Einstein's field equations that allow FTL travel. Some Mexican scientist figured it out quite recently.
His solution required an entire galaxy worth of mass converted directly into energy, which was essentially impossible. However, since then the solution has been optimised some what to the point where you only need 1 metric ton of mass converted to energy.
The maths is probably beyond anyone on 4chan, but it does exist.
I had a dream of that very story.
When i woke i began searching for information related to it.
Boy was i shocked when i came across that short and literally, word for word my dream lined up with it.
Because truth can only lead to truth through equivalences and logical linking. If you start with true axioms, you can only end up with true statements.
>what if our axioms are wrong
They are, it's called improving science.
>not just sucking it up and accepting the fact that interstellar travel takes decades in hibernation
Yes, but that's only when we talk about pure mathematics, when we apply math to model physics, it's always some approximation, it is entirely possible to apply mathematical model to physics in a wrong way and then even though math says something is true, it isn't in the real world.
>what sort of technology do you need to build an FTL drive/ship
If we knew, we would build one.
I stopped going to /sci/ because I was tired of people always asking retarded questions like this. Please go back there and stay.
FTL? Impossible via conventional propulsion methods. Universe says no.
Warp drive is theoretically possible. See the nasa drive above. I think you need something ridiculous like the entire output of the sun to power one though.
Fastest propulsion methods using currently available tech are nuclear explosion propelled craft. You drop nukes behind you and "ride the wave". For obvious reasons this is not a good idea. Project Orion is pictured.
Nuclear thermal rockets provide a high efficiency, but are not as efficient as ion engines. They are similar to conventional rockets, but first the fuel is passed through a nuclear fission reactor. The reactor heats the fuel before it is combusted, providing a higher exhaust speed. NASA's NERVA is pictured. These are fucking great and make getting to Mars much easier.
This is why transhumanism is a more pressing issue than deep space travel. If we obtained immortality through genetic engineering, biomechanical augmentations, etc. then the long distances would become a non issue. You could wake people in cycles to maintain the ship while the others remain in stasis.
I don't want transhumanism if it's going to be like modern technology, all nonfree, proprietary, filled with backdoors, logic bombs and security compromising bugs in source code.
>I never asked for this
>His solution required a few hundred universes worth of exotic matter
>a type of matter which may or may not actually exist
>However, since then the solution has been optimised some what to the point where you only need a couple of hundred metric tonnes of exotic matter
It's not very complicated. Here is how it works.
Let's pretend you're some ancient greek dude. You notice the sun is small in the sky and always show up in the morning, disappears at sunset.
So you assume the sun is some sort of ball/god/chariot that rotates around the earth.
Despite being wrong, it's a valid model (ie : a way to simplify something complex in order to actually get shit done about it) and you can use it to draw conclusions (the sun will rise tomorrow).
TL;DR : we look at what happens, build models to represent and compute stuff about shit, models turn out wrong so we build better ones. Models work through mathematics so using one model implies a lot of stuff about everything.
Ion engines use a high voltage metal grid to accelerate plasma providing propulsion. Efficiencies are very high, but so is the demand for electrical power. Thrust is also very low. propelling a large enough power source out of the solar system would be a challenge.
Ion engines have been used on several small space probes. The ESA's GOCE used one to skim the upper atmosphere, allowing it to make sensitive measurements of the earth gravitational field for a long period. It also looked totally badass and was dubbed "The Ferrari of space".
Take a look at the discovery of the Higgs Boson particle. The only reason we were able to find it was because of time dilation. No malfunctioning clocks here, just really fast subatomic particles who were finally able to live long enough to be measured thanks to time dilation.
Time dilation is, without a doubt, a real world phenomenon.
FTL travel is the same as traveling back in time. We have no evidence of any time travelers, and it's hard to believe nobody would want to travel to their past, so it is almost certainly impossible.
There would be laws and regulations, a lock that stopped you going back in time further then X-year, there would also be secret police, Time Traveling Gestapo to stop people from fucking up the continuum.
It's theoretically possible if you flip the sign on the mass component. However negative mass does not exist. Coincidentally, if it did exist, it would spawn an infinite amount of negative mass and every point in the universe of diverge. That would be inconvenient.
FTL also has the trouble of being incompatible with special relativity and causality. FTL allows for time travel.
I'll just write it before things go further
>inb4 John Titor, time travel search online experiment, Steins;Gate, mai waifu Back to the Future...
Please, let's concentrate on FTL
Tachyon bubble generator. Allows for near infinite 'speed' travel (orders of magnitude faster than light)
The Star Trek warp field drive works on a similar mechanic.
>someone actually made an app that calculates time dilation
>someone actually downloaded that app
or those messages that come in through commercials to buy things without the people actually saying it
anti matter is way or means to store energy, just like batteries don't make energy, they store energy.
The speed of light is not a limit to be broken. It is a conversion factor between dimensions in space and the dimension in time.
You can go very fast if you have very little mass, but you cannot exceed c because at c, transit time for you is already zero (all space no time).
If you think you can go FTL, it just means you failed the first quarter of Physics.
Once you can operate energies needed to FTL there is no point in actually going anywhere because you can do every conceivable thing in your own neighbourhood
Also there's that small matter where going FTL actually breaks the universe
its kinda like dividing by zero
The short answer to "can I create an opposite flashlight" is "yes", but the disappointment here is that anti-photons and photons are the same particles. Some particles are their own antiparticles, notably the force carriers like photons, the Z boson, and gluons, which mediate the electromagnetic force, the weak nuclear force, and the strong force, respectively. Particles that are their own antiparticles must be electrically neutral, because an aniparticle has the opposite electrical charge as its partner particle. Other things must also be zero, like the number of quarks. A neutron cannot be its own antiparticle because it is made up of quarks and an antineutron is made up of antiquarks. A pi_0 is made up of a quark and an antiquark and is in fact its own antiparticle also.
We need to get into space as soon as possible.
You know, I've always held myself to that theory. I never knew that it was string theory. I mean, considering that all it takes for a universe to be alternate, is for a single atom to be moved out of place. Therefore, the whole 'time travel can't exist because there are no time travellers' is moot. I never realised that's what string theory was pedalling.
the higgs boson did nothing to disprove sting theory
the fact supersymmetry hasn't been proven at the levels we were testing for the higgs has slaughtered it and many other models, thing with string is it's so fucking generic it can rebound from this shit
We need negative energy and a proof that says we can violate causality. According to relativity, FTL travel of any kind, even wormholes is time travel and time travel leads to time paradoxes.
See more on why here:
What about the whole 'the closer you travel to the speed of light, the slower you experience time' malarkey? Basically Interstellar, but I'm only using the movie as a reference because I'm not very good at explaining it.
80 000 km/h is slow as molasses just to travel around the solar system. It's achievable with gravity slingshots.
A primitive inter-system spaceship would accelerate much more than that, just by bothering to use a thruster.
Also keep in mind that Alcubierre himself dosn't think this would actually work as anything other than a thought experiment. And the story that "NASA is working on it" is overblown, they are trying to develop a way to detect if space might be warped in this manner in other galaxies, not trying to build one themselves.
There is also the issue that if you could build an Alcubierre drive, you could also use it to go back in time and cause time paradoxes.