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Time Travel Discussion
It’s simple yet some people still don’t understand it.
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<blockquote data-quote="Wind7" data-source="post: 252151" data-attributes="member: 6388"><p><em><strong><span style="color: rgb(247, 218, 100)">“Near massive bodies—near the surface of neutron stars or even at the surface of the Earth, although it’s a tiny effect—time runs slower than it does far away,” says Dave Goldberg, a cosmologist at Drexel University.</span></strong></em></p><p><span style="color: rgb(247, 218, 100)"><em><strong></strong></em></span></p><p><span style="color: rgb(247, 218, 100)"><em><strong>If a person were to hang out near the edge of a <a href="https://www.scientificamerican.com/article/how-the-inside-of-a-black-hole-is-secretly-on-the-outside/" target="_blank">black hole</a>, where gravity is prodigious, Goldberg says, only a few hours might pass for them while 1,000 years went by for someone on Earth. If the person who was near the black hole returned to this planet, they would have effectively traveled to the future. “That is a real effect,” he says. “That is completely uncontroversial.”</strong></em></span></p><p><span style="color: rgb(247, 218, 100)"><em><strong></strong></em></span></p><p><span style="color: rgb(247, 218, 100)"><em><strong>Going backward in time gets thorny, though (thornier than getting ripped to shreds inside a black hole). Scientists have come up with a few ways it might be possible, and they have been aware of time travel paradoxes in general relativity for decades. Fabio Costa, a physicist at the Nordic Institute for Theoretical Physics, notes that an early solution with time travel began with a scenario written in the 1920s. That idea involved massive long cylinder that spun fast in the manner of straw rolled between your palms and that twisted <a href="https://www.scientificamerican.com/article/what-is-spacetime-really-made-of/" target="_blank">spacetime</a> along with it. The understanding that this object could act as a <a href="https://blogs.scientificamerican.com/critical-opalescence/time-machines-would-run-afoul-of-the-second-law-of-thermodynamics/" target="_blank">time machine</a> allowing one to travel to the past only happened in the 1970s, a few decades after scientists had discovered a phenomenon called “closed timelike curves.”</strong></em></span></p><p><span style="color: rgb(247, 218, 100)"><em><strong></strong></em></span></p><p><strong><em><span style="color: rgb(247, 218, 100)">“A closed timelike curve describes the trajectory of a hypothetical observer that, while always traveling forward in time from their own perspective, at some point finds themselves at the same place and time where they started, creating a loop,” Costa says. “This is possible in a region of spacetime that, warped by gravity, loops into itself.”</span></em></strong></p><p></p><p><span style="color: null">----------------------------------------------------------------------------------------</span></p><p><span style="color: null"></span></p><p><span style="color: null">Source> <a href="https://www.scientificamerican.com/article/is-time-travel-possible/" target="_blank">Is Time Travel Possible?</a></span></p></blockquote><p></p>
[QUOTE="Wind7, post: 252151, member: 6388"] [I][B][COLOR=rgb(247, 218, 100)]“Near massive bodies—near the surface of neutron stars or even at the surface of the Earth, although it’s a tiny effect—time runs slower than it does far away,” says Dave Goldberg, a cosmologist at Drexel University.[/COLOR][/B][/I] [COLOR=rgb(247, 218, 100)][I][B] If a person were to hang out near the edge of a [URL='https://www.scientificamerican.com/article/how-the-inside-of-a-black-hole-is-secretly-on-the-outside/']black hole[/URL], where gravity is prodigious, Goldberg says, only a few hours might pass for them while 1,000 years went by for someone on Earth. If the person who was near the black hole returned to this planet, they would have effectively traveled to the future. “That is a real effect,” he says. “That is completely uncontroversial.” Going backward in time gets thorny, though (thornier than getting ripped to shreds inside a black hole). Scientists have come up with a few ways it might be possible, and they have been aware of time travel paradoxes in general relativity for decades. Fabio Costa, a physicist at the Nordic Institute for Theoretical Physics, notes that an early solution with time travel began with a scenario written in the 1920s. That idea involved massive long cylinder that spun fast in the manner of straw rolled between your palms and that twisted [URL='https://www.scientificamerican.com/article/what-is-spacetime-really-made-of/']spacetime[/URL] along with it. The understanding that this object could act as a [URL='https://blogs.scientificamerican.com/critical-opalescence/time-machines-would-run-afoul-of-the-second-law-of-thermodynamics/']time machine[/URL] allowing one to travel to the past only happened in the 1970s, a few decades after scientists had discovered a phenomenon called “closed timelike curves.” [/B][/I][/COLOR] [B][I][COLOR=rgb(247, 218, 100)]“A closed timelike curve describes the trajectory of a hypothetical observer that, while always traveling forward in time from their own perspective, at some point finds themselves at the same place and time where they started, creating a loop,” Costa says. “This is possible in a region of spacetime that, warped by gravity, loops into itself.”[/COLOR][/I][/B] [COLOR=null]---------------------------------------------------------------------------------------- Source> [URL="https://www.scientificamerican.com/article/is-time-travel-possible/"]Is Time Travel Possible?[/URL][/COLOR] [/QUOTE]
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