I'm assuming you meant that you could only travel to the same spot on earth when it was in the same place in it's revolutionary cycle around the sun so you would land on earth instead of space, but you have to take into account the expansion of the universe too.
Yes, But the movement of the sun would be minimal each year, and even with the movement of the earth through natural disasters, you would need to travel a long way to se any serious difference in location.
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· 8 years ago
Nooooooooo no no... Even just scale comparison between earth distance and sun distance (what is a lot and what is negligible for each) would account for thousands of miles of shift at least
The universe is expanding at a rate of 74.3 +/- 2.1 kilometers per second, per megaparsec, if you care to do the conversions and the small scale math. Bottom line: youcannotwin is right.
Fun fact: it's been a while since I've done the math, but past about 14 billion light years away, the rate of expansion exceeds the speed of light. This is called the light horizon and it means that we will never, ever see past it. Information beyond this threshold is as lost to us as information in a black hole.
Some people think the fifth dimension must be time, so if our machine can travel through time, space must be no issue, as it would essentially be the same thing. Of course, nobody has said a time machine has to be stationary. In fact, many believe that the machine would have to physically move, at speeds higher than lightspeed. But that's probably not the time machine we would want, as it would be a one way trip.
But since you're going back, wouldn't the earth also go back? Yknow, since it was the past and that's the exact place it was in the past, the place you're going to?
I probably sound confusing...
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· 8 years ago
No you make perfect sense and make a fair point, you are just assuming that time and space are directly linked
That's the whole point, you in the future would press the button say a couple months back and earth would go back to wherever it was a couple months ago
Fun fact: it's been a while since I've done the math, but past about 14 billion light years away, the rate of expansion exceeds the speed of light. This is called the light horizon and it means that we will never, ever see past it. Information beyond this threshold is as lost to us as information in a black hole.
I probably sound confusing...