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I Explain Time
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<blockquote data-quote="Kairos" data-source="post: 170485" data-attributes="member: 10263"><p>My main criticism of the OP is that getting back to the future, presumably, would involve <em>either</em> acceleration or gravity, not just gravity. Gravity and acceleration are essentially the same in effect.</p><p></p><p>So, taking his premise at face value, one could posit that a sufficiently advanced civilization in the future could build something like what we today call UFOs that would travel to a previous point in time, but in order to get back to their origin, they'd need to do some kind of circuit between here and a nearby star. As long as the ship maintains constant acceleration, time relative to Earth will be very different.</p></blockquote><p></p>
[QUOTE="Kairos, post: 170485, member: 10263"] My main criticism of the OP is that getting back to the future, presumably, would involve [I]either[/I] acceleration or gravity, not just gravity. Gravity and acceleration are essentially the same in effect. So, taking his premise at face value, one could posit that a sufficiently advanced civilization in the future could build something like what we today call UFOs that would travel to a previous point in time, but in order to get back to their origin, they'd need to do some kind of circuit between here and a nearby star. As long as the ship maintains constant acceleration, time relative to Earth will be very different. [/QUOTE]
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