A question about time travel and the universe?

Question

I heard that the universe is constantly expanding, well if the universe is constantly expanding then matter and energy must be expanding with it, so if a person was able to travel back say 5000 years in the the past would his atomic mass be altered do to the fact that the universe of 5000 years ago would be more dence than it is today, if it was altered what would the results be?

Answer 1

The guy before me has a HUGE answer but the short answer would be yes AND no. Lets pretend (or assume) that everything in the world is getting larger. If the "rulers" we use to measure those things get larger too, then we will never know, therefore we do NOT get larger relative to anything else.

Answer 2

When something expands, it is reachin equillibrium, expanding... Entropy... It would not be possible to alter the atomic mass of so much energy, no matter how dense it was. You cannot alter the mass of pure energy. 5000 years in the past, however, could help us... We could actually stop civilization from ever started thinking about gold, or riches... Keep civilization from wanting something other than survival... However, if we still lived as we did 5000 years ago, with as much of a population the world has now.... Many people would never be born from the cause of it. Humankind would not be as it was...

So the question is.. If you could time travel into the past, could you alter future events... Well, of course! But if you could go to the future, you would not hope to change future events... Unless you altered a past event which destroyed the future event, when the "Victim" is helpless... But, what is it like to universally forget things? Is time a frequency which we can move on?

NO! We cannot move through time. If we move to a star, yes, we would travel into its future, but only because the past is where we were. the future is a frequency measured alone by the wavelength of light. Believe it or not, time was created when light and "visibility" of things we here. You just have to understand that really... There is no such thing as time in space. If you could snap your fingers to the star, it would have been 3 billion years older, but only because when you saw it, you were 3 billion "Lightyears" away from it. It is a measure of distance and energy (light).. You couldn't say.. Oh, it's about 200 years away. Only if you said it's distance is 1.5 X 10^8 kmh and we are speeding through space at 55,000 kmh...

Answer 3

I agree with everyone here. 5,000 years is far to short of a time frame to deal with. If you said something like five million or 50 million then yeah probably so. But as someone else said, everything will expand, including your measuring instruments. But we will never know.

Answer 4

This is one of the problems with time travel.

And, quite frankly, the universe is SOOOOOOOOOOOOOOOO big and has been around SOOOOOOOOOOOOOOOO long, that travelling back 5,000 dinky little years isn't likely to cause any individual a problem.

Now 5,000 BILLION years, that might be something else--but 5,000 years is a tiny fraction of time in universal terms.

So--go!
Have fun!
(-;

Answer 5

The atomic mass has not changed. What expands is the distances between objects, not the mass of the objects.

Answer 6

5000 years does not sound like very much time on the cosmic scale. He probably would not be altered, except maybe minutely.

Answer 7

if you add a billion years to that number, then maybe (its a possibility). But I have some serious arguements, consider this:

we are not being streached, think about it, lets say you were a mouse, and you were in a cage. Lets say we take you out of that cage and put you in a bigger cage, Does your mass grow?

NO!