Is time travel possible?

[cyberninja45]

Viper1 said:

cyberninja45 said:

Viper1 said:
Even if time travel were possible, there would be one major quirk in the works that would pretty much kill anything that did.

Any and all transitions from one time period to the next (such as what happens to us constantly anyway) is accompanied by a physical change in location. By that I mean the Earth is constantly moving along many different vectors - rotation on the axis, around the sun, around the galaxy and through space itself. In relative terms, we're moving about 850,000 miles per hour - nearly 400 km every second.

That means that wherever in time you travel to will be in the middle of a vast empty void millions to billions to miles away from Earth itself.

The only way to compensate for the change in location would be to have some means to not just travel in time but through space with incredible accuracy and at speeds well in excess of light. Unfortunately you'd also attain infinite mass and turn into a black hole thereby destroying Earth upon arrival.

But if at somepoint we were actually able to invent a time travelling machine I suppose we would also have the technology to calculate the coordinates of the the earth in space at that particular point in time. It should be an easy hurdle to over come.

You're still missing what I noted in my final paragraph.  Having the coordinates alone is simply not good enough.  You'd also need to travel to that new location immediately.    That kind of immediate travel would require a form of worm hole. 

So we don't just need the ability to travel in time but the ability to generate a worm hole at will and between any two points.   To really compolicate this, you'd have to generate the receiving end of the worm hole in the new time period.

Let's really look at this.  You need to begin a time travelling session.  Then you open a moving worm hole entrance (it must be in perfect sync with Earths own vector or it would immediately get left behind).  Now you generate the receiving end worm hole in that new period all moving at the same vector of the receiving end.    If your calculations are off even by even a plancks length, you're dead.

Travel 1 year into the future or past and you'll need to offset your wormhold location by 7.2 billion miles and the receiving wormhole must be moving in sync with Earth at ~820,000 miles per hour with perfect rotation to the axis, sun, galaxy, etc... Want to travel 1,000 years into the past, 7.2 trillion miles of displacement from origin.  To say nothing of the fluctations in the vectors as affected by trillions of gravitational sources plus the rate of universal expansion caused by dark matter.  And ALL frames of reference are also moving so you'd have nothing to calculate your new location against.

I understand what you are saying destruction of the earth was not my concern.

But as you explained it there I keep picturing in my head my analogy of someone outside our universe observing it. As I said in another post it would be like watching a roll of movie film with each frame unwinding at the speed of light (each frame being a frame of reference). From your explanation and conventional science it would certainly seem like the expansion of the universe and time are one and the same like my movie film analogy.