Time Travel question

[toylion]

If time travel were to ever be possible, how come nobody from the future has traveled back to a moment in recent history? Thoughts that keep me awake at night

Maybe because the future hasn't happened yet.

 

[Voorhees27]

Last Saturday I travelled back in time to Sunday of last week. Once there I was attacked by myself who was rubbing one out. Kinda weird.

 

[yodasan]

If it was ever possible, we would know about it by now.

This is the best answer - end of story.

 

[Mr. Green]

Last Saturday I travelled back in time to Sunday of last week. Once there I was attacked by myself who was rubbing one out. Kinda weird.

huh? are u sure ur not traveling like the rest of us? like Sunday comes after Saturday. And mirror can do that. Or was it the Sunday before last Saturday? Or do some people consider last Sunday to be the beginning of this week. Urgh, clearly I've been on this thread too long.

 

[Centurion]

 

[kl241]

If you could travel in time and change the past you would be creating a new timeline parallel to the one you originated from hence the Grandfather Paradox which states that if you could go back in time and kill your grandfather or father, you would still exist because you existed in a reality in which they were never killed. This has always been one of my biggest problems with the disappearing photograph in Back to the Future because that would never happen. It was only used as a narrative device to try to explain the confusion of paradoxes to the common audience. The photograph was taken in the timeline you came from and those events did happen, you've now changed an alternate timeline where they didn't happen and you still exist and don't fade from a photograph or start to fade from reality like Marty did.

 

[Blackthornone]

It is possible that when going back in time, you could travel to another dimension that looks just like the one you know, and you assume you change events in your dimension but it is really another one, and you just disappear from your own dimension. It's a maybe.

 

[devilof76]

Um...you can't time travel.

Dimensions are mathematical variables. They aren't places, and neither are 'times'.

Maybe because the future hasn't happened yet.

Yay for rationality!!!

The past no longer exists. The future has yet to. How anyone thinks there is even the remotest possibility of getting to either never fails to crack me up. The present exists, and only the present. If quantum theorists haven't figured that one out, then gods help us...

 

[Mr Quimper]

Many many many years ago (must be about 15 years now) I spent $10 joining TheTimeTravel Fund. I sent off my $10 and got a certificate saying "You're in the club" or something similar.

The idea is that the money sits in an account and when the research (not if - when) reaches a point where time travel is proved possible they will pay to "rescue" you at your point of death and bring you back to the future.

I love the idea that just as I'm about to step into the road some random guy will grab my arm, pull me to safety from an out of control truck right at the last second and whisper in my ear....."We did it!" before we vanish a-la Star Trek transporter style where I'm zapped off to the future to finally get a robot slave and hoverboard.

YAY FOR TIMETRAVEL!!!

 

[Blackthornone]

Um...you can't time travel.

Dimensions are mathematical variables. They aren't places, and neither are 'times'.



Yay for rationality!!!

The past no longer exists. The future has yet to. How anyone thinks there is even the remotest possibility of getting to either never fails to crack me up. The present exists, and only the present. If quantum theorists haven't figured that one out, then gods help us...

Dimensions are also measurements, and as such are absolutes, and not variables. However, the type of dimension I mentioned was a parallel universe, which physicists have discussed as possible. They are onlyunproven.

 

[Centurion]

Time traveling is possible only at 88mph.

 

[Blackthornone]

Time traveling is possible only at 88mph.

Actually it is possible traveling faster than the speed of light.

 

[Devil_666]

Last Saturday I travelled back in time to Sunday of last week. Once there I was attacked by myself who was rubbing one out. Kinda weird.

Sounds hot.

Actually it is possible traveling faster than the speed of light.

Actually it isn't. That's a theory and like all theories it's unproven.

 

[AIR]

Maybe because the future hasn't happened yet.

Man, I wish I had thought of that

 

[ShadowX81]

If time travel were to ever be possible, how come nobody from the future has traveled back to a moment in recent history? Thoughts that keep me awake at night

According to a professor at my old college that is currently building a time machine, the machine needs to have a "receiving end" as well as a point from where you travel. Meaning you can only travel back as far as the time that the first time machine was turned on.

Bad news for anyone that was looking forward to killing Hitler, but think of all the screwed up stuff we are bound to do in the future that we can fix.

 

[Devil_666]

According to a professor at my old college that is currently building a time machine...

Yeah.. he's an idiot.

 

[ShadowX81]

Do you even know anything about the project?

 

[Blackthornone]

Last Saturday I travelled back in time to Sunday of last week. Once there I was attacked by myself who was rubbing one out. Kinda weird.

You are actually the Time Ranger?

[ame]https://www.youtube.com/watch?v=ruR0ORHvi3A[/ame]

 

[Intruder04]

Oh, no. Those type of black holes that you are referring to are stellar black holes and are already "collapsed" (as in the case of stars that are above the Chandrasekhar mass limit). The collapsing only happens once, and a stellar black hole will continue to lose its mass in the form of thermal energy and gamma ray bursts - provided that it's not drawing in any nearby matter.

A galactic black hole (like in the center of the Milky Way), on the other hand, was formed enormous rotating nebula and gas clouds. This type of black hole was never in a "collapsed" state, and just became millions of times more massive than the sun by feeding on matter.

The key thing to know, is that as long as a black hole (stellar or galactic) isn't "feeding" on matter, it's losing energy and evaporating.

Also, the more massive the black hole, the larger its event horizon. In order to effectively use that variation of the "Twin Paradox" that I mentioned before (which was postulated by Stephen Hawking by the way ), a galactic black hole will have to be used; in order to provide a large enough time dilation for the space ship, as well as a large enough orbital acceleration.

What becomes of it after it exhausts all of its energy? And won't it be continually 'fed' with all the matter present in the universe?

I feel that the following is appropriate at this time.

https://www.youtube.com/watch?v=cFods1KSWsQ

Maybe.......they.......have......

Wait a minute.....are you....??

You are creating a paradox right now by wasting so much time thinking about time travel. Your future self will want to go back in time and make you do something constructive like start your own polygamous cult! Look man, you will never be able to go back and keep those kids from flying your underwear on the flagpole at summer camp. Even if you could, I'm sure you'd still have an unexplainable fear of the national anthem.

But really hasn't this question been the focus of nearly every single time travel story out there? Come on man, you gotta make up your own mind and write a book.

Yes but it's fascinating to bring it up every once a while.

Maybe because the future hasn't happened yet.

Depends.

Last Saturday I travelled back in time to Sunday of last week. Once there I was attacked by myself who was rubbing one out. Kinda weird.

Which one came back?

Urgh, clearly I've been on this thread too long.

Don't worry, we're just getting started.

If you could travel in time and change the past you would be creating a new timeline parallel to the one you originated from hence the Grandfather Paradox which states that if you could go back in time and kill your grandfather or father, you would still exist because you existed in a reality in which they were never killed. This has always been one of my biggest problems with the disappearing photograph in Back to the Future because that would never happen. It was only used as a narrative device to try to explain the confusion of paradoxes to the common audience. The photograph was taken in the timeline you came from and those events did happen, you've now changed an alternate timeline where they didn't happen and you still exist and don't fade from a photograph or start to fade from reality like Marty did.

That is not the grandfather paradox.

Um...you can't time travel.

Dimensions are mathematical variables. They aren't places, and neither are 'times'.

The past no longer exists. The future has yet to. How anyone thinks there is even the remotest possibility of getting to either never fails to crack me up. The present exists, and only the present. If quantum theorists haven't figured that one out, then gods help us...

I believe you can although not to the past.

Dimensions are also measurements, and as such are absolutes, and not variables. However, the type of dimension I mentioned was a parallel universe, which physicists have discussed as possible. They are onlyunproven.

Time traveling is possible only at 88mph.

Ohnotheydidn't!!

Actually it is possible traveling faster than the speed of light.

Go on...

 

[Blackthornone]

Einstein's theory of Special Relativity.

https://spaceplace.nasa.gov/review/dr-marc-space/time-travel.html


"Special Relativity also says that a surprising thing happens when you move through space-time, especially when your speed relative to other objects is close to the speed of light. Time goes slower for you than for the people you left behind. You won't notice this effect until you return to those stationary people.

Say you were 15 years old when you left Earth in a spacecraft traveling at about 99.5% of the speed of light (which is much faster than we can achieve now), and celebrated only five birthdays during your space voyage. When you get home at the age of 20, you would find that all your classmates were 65 years old, retired, and enjoying their grandchildren! Because time passed more slowly for you, you will have experienced only five years of life, while your classmates will have experienced a full 50 years.

Time traveler

So, if your journey began in 2003, it would have taken you only 5 years to travel to the year 2053, whereas it would have taken all of your friends 50 years. In a sense, this means you have been time traveling. This is a way of going to the future at a rate faster than 1 hour per hour. "