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<blockquote data-quote="Umbran" data-source="post: 6637096" data-attributes="member: 177">With respect, the fractions of a second involved there are not what laymen are thinking of when they hear the term.&nbsp; They're thinking about the Interstellar &quot;if we take this path, we will age little, but many years will pass on Earth,&quot; variety.&nbsp; Kip Thorne wrote, &quot;Black Holes and Time Warps: Einstein's Outrageous Legacy&quot; in 1994.&nbsp; It has been a while since I opened my copy, but on the other hand it is now 20 years old.&nbsp; I'd be surprised if Kip hasn't gone well beyond that work by now.The ones that *don't* use exotic matter require a particular modification to General Relativity, <a href="http://en.wikipedia.org/wiki/Gauss%E2%80%93Bonnet_gravity" target="_blank">Gauss-Bonnet gravity</a>, involving some extra spacial dimensions, to be correct.&nbsp; Such solutions are often associated with brane theory.&nbsp; So, unless we have enough branes, we need exotic matter to do the job.&nbsp; Pun intended.&nbsp; <img src="https://cdn.jsdelivr.net/joypixels/assets/8.0/png/unicode/64/1f61b.png" class="smilie smilie--emoji" loading="lazy" width="64" height="64" alt=":p" title="Stick out tongue&nbsp; &nbsp; :p"&nbsp; data-smilie="7"data-shortname=":p" /> You might want to clarify what you mean by the &quot;same part of space&quot;.</blockquote>

[QUOTE="Umbran, post: 6637096, member: 177"] With respect, the fractions of a second involved there are not what laymen are thinking of when they hear the term. They're thinking about the Interstellar "if we take this path, we will age little, but many years will pass on Earth," variety. Kip Thorne wrote, "Black Holes and Time Warps: Einstein's Outrageous Legacy" in 1994. It has been a while since I opened my copy, but on the other hand it is now 20 years old. I'd be surprised if Kip hasn't gone well beyond that work by now. The ones that *don't* use exotic matter require a particular modification to General Relativity, [url=http://en.wikipedia.org/wiki/Gauss%E2%80%93Bonnet_gravity]Gauss-Bonnet gravity[/url], involving some extra spacial dimensions, to be correct. Such solutions are often associated with brane theory. So, unless we have enough branes, we need exotic matter to do the job. Pun intended. :p You might want to clarify what you mean by the "same part of space". [/QUOTE]

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