Mystery Time travellers

[Howard Littlejohn]

Certainly forward travel is time is possible. Relativity sees to that, as Pessimistic was getting at. The closer to light speed one travels, the more time is dilated in respect to an outside object.
So, in theory you cold travel for a few hours (as an example without the mathematics), come back to Earth and months or years could have passed - depending on how close to light speed you were. This has been measured in tiny fractions of a second with existing satellites. In effect, we already have forwards time machines, albeit on an incnsequential scale.
Some suggest that travelling faster than light may do the same, except reversing time. (That isn't necesarily widely accepted. Or at least wasn't, the thinking may have changed. But it did make for a great Red Dwarf episode, set largely in Nodnol.)

Travelling faster than light is theoretically possible. Only travelling at the speed of light is believed impossible and then only for something with mass (which is part of the reson why light is believed to have zero rest mass). Mass becomes infinite, requiring infinite energy, to reach light speed. That is clearly impossible in a finite universe.

 

[FootyJunkie]

Mass becomes infinite, requiring infinite energy, to reach light speed. That is clearly impossible in a finite universe.

But I thought the universe was infinite.

 

[Howard Littlejohn]

But I thought the universe was infinite.

No, just very, very large.

 

[JuddsABlue]

No, just very, very large.

I recently saw an experiment in mapping the universe that suggested it was infinite, but I can't remember much else than that

 

[Pessimistic]

Certainly forward travel is time is possible. Relativity sees to that, as Pessimistic was getting at. The closer to light speed one travels, the more time is dilated in respect to an outside object.
So, in theory you cold travel for a few hours (as an example without the mathematics), come back to Earth and months or years could have passed - depending on how close to light speed you were. This has been measured in tiny fractions of a second with existing satellites. In effect, we already have forwards time machines, albeit on an incnsequential scale.
Some suggest that travelling faster than light may do the same, except reversing time. (That isn't necesarily widely accepted. Or at least wasn't, the thinking may have changed. But it did make for a great Red Dwarf episode, set largely in Nodnol.)

Travelling faster than light is theoretically possible. Only travelling at the speed of light is believed impossible and then only for something with mass (which is part of the reson why light is believed to have zero rest mass). Mass becomes infinite, requiring infinite energy, to reach light speed. That is clearly impossible in a finite universe.

Inconsequential ? Maybe. If we could get information from the future even a few minutes it could be valuable.

Think monitoring for cataclysmic events like earthquakes. it could be a huge life saver. Sureif it happened thered have to be regulation because of people using it for gambling scams, in sports and financial futures.

If a compsny did invent it they could set it up in such a way that their reciever, being the first ever built would be infinitely valuable because any built later could never communicate further into the past than it could. Others could improve on your invention but they could never ever communicate further in the past than you could. The strategies you could employ to maintain your competitive financial advantage would be as complex as the invention itself.

 

[Sydney Bloods]

Travelling faster than light is theoretically possible. Only travelling at the speed of light is believed impossible and then only for something with mass (which is part of the reson why light is believed to have zero rest mass). Mass becomes infinite, requiring infinite energy, to reach light speed. That is clearly impossible in a finite universe.

Not exactly, it's reaching the speed of light that's the problem. And even then it's some what possible that people have misunderstood Einstein.

The C=MC2 equation actually states that an object continually gains mass as it approaches the speed of light.

The most common belief is that the requires infinite energy, but there's a growing number that suggest if you can plot how much mass the object gains as it approaches light (before reaching light) it is possible to counter this by correctly calculating how much energy is required Prior to reaching light.

This would of course mean that the objects acceleration cannot come from an on board fuel source but would need to propelled an outside force.

Think of launching a cannon ball from some sort of super cannon instead of calculating how much energy is required for cannon ball to reach the speed of light you calculate how much the cannon ball would weigh when it reached the speed of light (based on how much mass it gains say per second as it reaches the speed of light)

And apply that much force to the Canon ball at launch. This why the cannon ball reaches light speed before you run out of energy.

 

[Pessimistic]

How much weight would information signals have ?

 

[Sydney Bloods]

How much weight would information signals have ?

Depends on the source your using.
If using photons to send the information then at rest zero.

Its weightless, but when in motion it travels just shy of the speed of light.

And like all things it gain mass (and therefore weight) when in motion it's mass is measured at around 5.42MeV don't ask me to explain that measurement as its beyond me (let's just say it's a fraction of a bees dick)

 

[Pessimistic]

Yeah, I should have said mass.

Does anyone have links to discussions of cross time communication rather than time travel ?

 

[Yellow Feathers]

Thought this was interesting (and kinda funny/stupid):

http://www.extremetech.com/extreme/...h-the-internet-for-evidence-of-time-travelers

 

[wce4premiership]

Apologies if posted but I have always found this particular incident the most intriguing

http://en.wikipedia.org/wiki/Moberly-Jourdain_incident

 

[Pessimistic]

Thought this was interesting (and kinda funny/stupid):

http://www.extremetech.com/extreme/...h-the-internet-for-evidence-of-time-travelers

That is interesting. Do they think people travelled and then got on the net, or would they find some way to communicate back and then link to the internet

Leaving information from the future is easily faked, unless it is not known yet


For mine proof would need to be some complex trace which never repeats, maybe the trace of seismic probes or sunspot activity. You record the supposed transmitted trace then compare it to the trace when it actually occurs. Such a recording would be unfakeable

 

[MaddAdam]

Why time travellers shouldn't kill Hitler

http://www.theguardian.com/science/brain-flapping/2014/feb/21/time-travellers-kill-adolf-hitler

 

[Pessimistic]

Thats the last thing i would do.

Even if you survived the time travel which is the biggest problem imo, youd be all on to survive as youd stick out like dogs balls. Even if you didn't stand out go back far enough and even strangers in any area would get prodded if they were lucky, more likely beaten or killed

 

[Kram]

If you wiped out Hitler someone would else would just take his place, there was always going to be another massive European conflict.

 

[LicoriceAllsorts]

I'm pretty sure the universe isn't infinite, is that even possible?

 

[WCErevival]

I'm pretty sure the universe isn't infinite, is that even possible?

They had a show on tv a couple of months ago where they measured the universe to see if it was a sphere. It wasn't. So they think it is infinite.

 

[Sydney Bloods]

I'm pretty sure the universe isn't infinite, is that even possible?

from our perspective pretty much us but the universe does have a certain size (which is expanding) as can be calculated but you won't ever reach the "end" of the universe because the universe is everything. its all fuzzy science that's beyond my full comprehension.

 

[Dannnnnnnnnn]

Yeah the whole "size of the universe" thing is something I stay well away from, just too complex for me. I'm a psych student, I don't do real science.

 

[DivideandMultiply]

Time travel.....Really interesting topic. I was searching photos and found this

I have a few problems with this,

1. Im not experienced on photo editing but something tells me that the best of the best could pull this off.
2. Wouldn't anyone around them wonder what the hell this bloke is doing.

You do a quick search on the net and there is threads on military sites working on such thing. Crazy stuff if true

Not sure, but I remember reading a thread where someone explains that neither the glasses, nor clothing was unusual. IIRC gave examples and other pictures as reference.

 

[Sublime]

You guys are breaking my brain.

Now, continue!

 

[Hank Scorpion]

I'm pretty sure the universe isn't infinite, is that even possible?

I guess it depends on what you define as "the universe." If you define the universe as the area occupied by all matter, then the universe is not infinite unless there is infinite matter. It is however expanding.

If you include spaces which hold no matter as part of "the universe," then in my mind, the universe is infinite.

 

[LicoriceAllsorts]

They had a show on tv a couple of months ago where they measured the universe to see if it was a sphere. It wasn't. So they think it is infinite.

Technically I thought that if it was caused by a 'big bang' then it would be expanding and therefore would have an edge/ end to it. But if we're saying that there already was a space and the big bang happened in space then it would be never ending???

 

[LicoriceAllsorts]

from our perspective pretty much us but the universe does have a certain size (which is expanding) as can be calculated but you won't ever reach the "end" of the universe because the universe is everything. its all fuzzy science that's beyond my full comprehension.

Exactly what I thought

 

[LicoriceAllsorts]

I guess it depends on what you define as "the universe." If you define the universe as the area occupied by all matter, then the universe is not infinite unless there is infinite matter. It is however expanding.

If you include spaces which hold no matter as part of "the universe," then in my mind, the universe is infinite.

Pretty much what I just said to someone else, it's similar to numbers in that there is infinite amount of numbers but we don't have a name for all of them, the number line is never ending (how much space there is) but the the names for the numbers (the actual matter in space) is limited and technically expanding