{"id":2248171,"date":"2026-11-08T06:26:22","date_gmt":"2026-11-08T03:26:22","guid":{"rendered":"https:\/\/analyse.optim.biz\/?p=2248171"},"modified":"2026-11-08T06:26:22","modified_gmt":"2026-11-08T03:26:22","slug":"no-going-back-physicists-proof-claims-time-travel-can-only-take-us-to-the-future","status":"publish","type":"post","link":"https:\/\/analyse.optim.biz\/?p=2248171","title":{"rendered":"No going back: physicist\u2019s proof claims time travel can only take us to the future"},"content":{"rendered":"<p>[analyse_image type=&#8221;featured&#8221; src=&#8221;https:\/\/images.euronews.com\/articles\/stories\/09\/98\/00\/46\/1200x675_cmsv2_2489eaeb-b835-512d-97d4-ea4e62629349-9980046.jpg&#8221;]<\/p>\n<article id=\"abe-2940499-pos1-c-latest-stories\" class=\"the-media-object m-modeMobile-1 m-modeDesktop-1 the-media-object--has-video\" data-nid=\"2940499\" data-cid=\"9985704\" data-part-label=\"Partner content\">\n<figure id=\"abe-2940499-label-pos1-c-latest-stories\" class=\"the-media-object__figure\"><img decoding=\"async\" class=\"the-media-object__image\" src=\"https:\/\/images.euronews.com\/articles\/stories\/09\/98\/57\/04\/189x106_cmsv2_c0c63883-4d30-5cf3-b6cc-fcc11823d6aa-9985704.jpg\" loading=\"lazy\" alt=\"Battery storage of Nukus 2 project\" height=\"9\" width=\"16\"><\/figure>\n<div class=\"the-media-object__content\">\n                    Business<\/p>\n<div class=\"the-media-object__title  \">\n<p>    Central Asia&#8217;s first wind-and-battery project nears completion\n  <\/p><\/div>\n<\/div>\n<\/article>\n<article id=\"abe-2940751-pos2-c-latest-stories\" class=\"the-media-object m-modeMobile-1 m-modeDesktop-1 the-media-object--has-video\" data-nid=\"2940751\" data-cid=\"9987033\" data-part-label=\"Partner content\">\n<figure id=\"abe-2940751-label-pos2-c-latest-stories\" class=\"the-media-object__figure\"><img decoding=\"async\" class=\"the-media-object__image\" 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width=\"16\"><\/figure>\n<div class=\"the-media-object__content\">\n                    Europe News<\/p>\n<div class=\"the-media-object__title  \">\n<p>    Five EU countries demand UK pays for electricity market access\n  <\/p><\/div>\n<\/div>\n<\/article>\n<article class=\"helper-site-row o-article-newsy\">\n<div class=\"helper-site-container o-article-newsy__container\">\n<div class=\"o-article-newsy__main\">\n<header class=\"h-grid o-article-newsy__main__header\">\n<nav aria-label=\"Breadcrumbs\" class=\"c-article-breadcrumbs\">\n<div id=\"adb-article-breadcrumb\" class=\"c-article-breadcrumbs__list\">\n<p>                          Next<\/p>\n<p>                          Tech News<\/p><\/div>\n<\/nav>\n<h1 class=\"c-article-redesign-title\">\n                            No going back: physicist\u2019s proof claims time travel can only take us to the future<\/h1>\n<div class=\"c-article-image-video u-position-relative \">\n<div class=\"js-superdiv u-aspect-ratio-16x9 u-position-relative \" data-controller=\"video-player\" data-sponsored=\"Partner content\"><img fetchpriority=\"high\" decoding=\"async\" class=\"js-poster-img c-article-media__img\" src=\"https:\/\/images.euronews.com\/articles\/stories\/09\/98\/00\/46\/1536x864_cmsv2_2489eaeb-b835-512d-97d4-ea4e62629349-9980046.jpg\" width=\"1536\" height=\"864\" loading=\"eager\" alt=\"Scientists study black holes to attempt to solve time travel. FILE\"><\/div>\n<div class=\"c-article-caption u-position-absolute\"><i id=\"article-caption-content\" class=\"c-article-caption__content\"><span class=\"c-article-caption__text\"><br \/>\n              Scientists study black holes to attempt to solve time travel. FILE<br \/>\n                    <span class=\"u-color-white\">&#8211;\u00a0<\/span><span class=\"c-article-caption__copyright\">Copyright\u00a0<\/span><span class=\"c-article-caption__credit\">AP Photo<\/span><\/span><\/i><\/div>\n<div class=\"c-article-image-copyright c-article-image-copyright--novideo\">\n      Copyright\u00a0AP Photo\n  <\/div>\n<\/div>\n<\/header>\n<div class=\"h-grid o-article-newsy__main__body u-article-content\">\n<div class=\"o-article-newsy__contributors-publication-date\">\n<div class=\"c-article-contributors\">\n  By&amp;nbspSimon Ormiston\n<\/div>\n<div class=\"c-article-publication-date\" data-timestamp=\"1794119182\">\n                    Published on                 <time datetime=\"2026-11-08T07:26:22+01:00\">8 November 2026 &#8211; 7:26 GMT+1<\/time><span class=\"c-article-publication-date__bullet\">\u2022<\/span>Updated<br \/>\n                                     <time datetime=\"2026-11-09T09:56:39+01:00\">9 November 2026 &#8211; 9:56 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src=\"https:\/\/www.euronews.com\/images\/vector\/social-icons\/article-redesign-telegram.svg\" width=\"48\" height=\"48\" alt=\"telegram\" class=\"u-show-for-desktop\" loading=\"lazy\"><span class=\"u-display-flex u-gap-1 u-show-for-mobile-only\"><img decoding=\"async\" src=\"https:\/\/www.euronews.com\/images\/vector\/social-icons\/article-redesign-vk.svg\" width=\"24\" height=\"24\" alt=\"vk\" loading=\"lazy\"><span>VK<\/span><\/span><img decoding=\"async\" src=\"https:\/\/www.euronews.com\/images\/vector\/social-icons\/article-redesign-vk.svg\" width=\"48\" height=\"48\" alt=\"vk\" class=\"u-show-for-desktop\" loading=\"lazy\"><span class=\"u-display-flex u-gap-1 u-show-for-mobile-only\"><img decoding=\"async\" src=\"https:\/\/www.euronews.com\/images\/vector\/social-icons\/article-redesign-bluesky.svg\" width=\"24\" height=\"24\" alt=\"bluesky\" loading=\"lazy\"><span>Bluesky<\/span><\/span><img decoding=\"async\" src=\"https:\/\/www.euronews.com\/images\/vector\/social-icons\/article-redesign-bluesky.svg\" width=\"48\" height=\"48\" alt=\"bluesky\" class=\"u-show-for-desktop\" loading=\"lazy\"><span class=\"u-display-flex u-gap-1 u-show-for-mobile-only\"><img decoding=\"async\" src=\"https:\/\/www.euronews.com\/images\/vector\/social-icons\/article-redesign-threads.svg\" width=\"24\" height=\"24\" alt=\"threads\" loading=\"lazy\"><span>Threads<\/span><\/span><img decoding=\"async\" src=\"https:\/\/www.euronews.com\/images\/vector\/social-icons\/article-redesign-threads.svg\" width=\"48\" height=\"48\" alt=\"threads\" class=\"u-show-for-desktop\" loading=\"lazy\"><span class=\"u-display-flex u-gap-1 u-show-for-mobile-only\"><img decoding=\"async\" src=\"https:\/\/www.euronews.com\/images\/vector\/social-icons\/article-redesign-whatsapp.svg\" width=\"24\" height=\"24\" alt=\"whatsapp\" loading=\"lazy\"><span>Whatsapp<\/span><\/span><img decoding=\"async\" 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loading=\"lazy\"><span>ADVERTISEMENT<\/span><\/div>\n<\/div>\n<div class=\"c-ad u-show-for-desktop\">\n<div class=\"c-ad__placeholder\"><img decoding=\"async\" class=\"c-ad__placeholder__logo\" src=\"https:\/\/www.euronews.com\/images\/logos\/logo-euronews-stacked-outlined-72x72-grey-9.svg\" width=\"72\" height=\"72\" alt loading=\"lazy\"><span>ADVERTISEMENT<\/span><\/div>\n<\/div>\n<\/div>\n<p>Would you head for the year 3000 to see what has become of the human race? Or would you crank the dial backwards like Marty McFly and risk sabotaging your own future? Before you start packing, a physicist has some news that may ruin a few Marvel movies: you may only be able to go one way, and it isn&#8217;t backwards.<\/p>\n<p>Hongsheng Zhang, a researcher at the University of Jinan in China, has shown that in a broad class of theoretical universes, travelling into your own past is impossible.<\/p>\n<p>The whole argument rests on one fact: &#8220;light can never point sideways to a traveller&#8217;s direction in time,&#8221; Zhang says.<\/p>\n<p>Imagine spacetime sliced into layers that light itself can travel along. Anything moving slower than light must cross these surfaces in the same direction, like climbing a staircase that never lets you step down.<\/p>\n<p>If you can only ever go up, you can never arrive back on the step where you started.<\/p>\n<p>&#8220;My paper asks a narrower question: when does a spacetime permit such a loop, and when does the geometry itself forbid one?&#8221; Zhang told Euronews Next.<\/p>\n<h2>The two loopholes<\/h2>\n<p>Physicists call journeys to the past &#8220;closed timelike curves&#8221;: routes through spacetime that loop back to the very place and moment they began. <\/p>\n<p>&#8220;Suppose you wanted to shake hands with your younger self,&#8221; Zhang says. &#8220;To do that you would need a path through spacetime that loops back on itself without ever exceeding the speed of light.&#8221; <\/p>\n<p>Einstein&#8217;s equations allow such paths in a handful of scenarios, such as near the core of a spinning black hole.<\/p>\n<p>Crucially, Zhang&#8217;s research, which has been submitted for peer review, also reveals exactly how a time machine could get around it, and there are only two ways.<\/p>\n<p>The first is twist. Imagine light rays that, instead of travelling side by side, spiral around one another like the strands of a rope. When that happens, the neat surfaces of light can&#8217;t form, so there is no staircase to keep you climbing.<\/p>\n<p>This is what happens near the centre of a spinning black hole. Einstein&#8217;s theory says a spinning mass drags space and time around with it, and close to the black hole&#8217;s core the drag is so strong that moving &#8220;forward in time&#8221; is bent into a circle.<\/p>\n<p>A traveller following that circle would see their clock ticking forward in time as normal, yet their journey would arrive back at the moment they set off. Physicist Brandon Carter showed in 1968 that such loops exist inside spinning black holes.<\/p>\n<p>But Zhang stresses that twist alone is not the culprit. &#8220;Twist on its own does not create a closed curve. It only blocks my argument,&#8221; Zhang says. &#8220;Twist is everywhere in the universe and, as far as we know, harmless.&#8221;<\/p>\n<p>The second is the shape of the universe itself. The staircase might be perfectly built, but it could lead around the sides of a building, so the top step leads straight back to the bottom, like the impossible staircases in an Escher drawing. You would keep climbing and still end up where you began. Most of the time machines physicists have designed on paper, including those built from wormholes, rely on this trick.<\/p>\n<p>Physicists call this loophole topology, and Zhang believes it is the one to watch. &#8220;The loophole that could matter is topology, and that is exactly the one that looks least likely to arise without deliberate engineering,&#8221; Zhang says.<\/p>\n<h2>Destination: tomorrow<\/h2>\n<p>Trips to the future, by contrast, are already well established. Einstein showed that moving very fast, or sitting in strong gravity, slows your clock relative to everyone else&#8217;s. Astronauts returning from six months aboard the International Space Station are about five thousandths of a second younger than they would otherwise have been, according to the European Space Agency.<\/p>\n<p>Zhang is keen to stress the limits of the work. &#8220;This is not a claim that time travel is impossible,&#8221; Zhang says.<\/p>\n<p>For now, though, you may want to pack for tomorrow rather than yesterday&#8230; unless you have the Time Stone, of course.<\/p>\n<\/div>\n<p>                                  Go to accessibility shortcuts<\/p>\n<div class=\"c-article-share-comment u-align-items-center u-display-flex\"><span class=\"c-article-share-comment__links u-align-items-center u-display-flex u-justify-content-center js-c-article-share-comment-share\"><span class=\"c-article-share-comment__label\">Share<\/span><\/span><span class=\"c-article-share-comment__label\">Comments<\/span><span class=\"c-article-share-comment__label c-article-share-comment__label--always\">Add Euronews on Google<\/span><\/div>\n<div id=\"adb-article-you-might-also-like\" class=\"perf-cv-auto c-article-you-might-also-like\">\n<h2 class=\"c-article-you-might-also-like__title\">\n        Read more<br \/>\n      <\/h2>\n<div class=\"c-article-you-might-also-like__container\">\n<article id=\"abe-2939249-pos0-c-article-you-might-also-like__item\" class=\"the-media-object m-modeMobile-1 m-modeDesktop-1 the-media-object--has-video\" data-nid=\"2939249\" data-cid=\"9979743\" data-part-label=\"Partner content\">\n<figure id=\"abe-2939249-label-pos0-c-article-you-might-also-like__item\" class=\"the-media-object__figure\"><img decoding=\"async\" class=\"the-media-object__image\" src=\"https:\/\/images.euronews.com\/articles\/stories\/09\/97\/97\/43\/480x270_cmsv2_821ec6a9-84e6-58e0-96a2-69cc47507e8d-9979743.jpg\" loading=\"lazy\" alt=\"Photo\" height=\"9\" width=\"16\"><\/figure>\n<div class=\"the-media-object__content\">\n                    Tech News<\/p>\n<h3 class=\"the-media-object__title  \">\n<p>    \u2018Zeptoverse\u2019: CERN scientists uncover evidence of extraordinarily rare particle decay<br \/>\n  <\/h3>\n<\/div>\n<\/article>\n<article id=\"abe-2939204-pos1-c-article-you-might-also-like__item\" class=\"the-media-object m-modeMobile-1 m-modeDesktop-1\" data-nid=\"2939204\" data-cid=\"9979549\" data-part-label=\"Partner content\">\n<figure id=\"abe-2939204-label-pos1-c-article-you-might-also-like__item\" class=\"the-media-object__figure\"><img decoding=\"async\" class=\"the-media-object__image\" src=\"https:\/\/images.euronews.com\/articles\/stories\/09\/97\/95\/49\/480x270_cmsv2_483366cd-1866-5317-88f2-56bc69b4bc8d-9979549.jpg\" loading=\"lazy\" alt=\"The EU is preparing to announce a proposal for restricting social media access to children. 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<\/h3>\n<\/div>\n<\/article>\n<\/div>\n<\/div>\n<div class=\"perf-cv-auto\">\n<ul id=\"adb-article-tags\" class=\"c-tags-list\">\n<li class=\"c-tags-list__item\">\n<section class=\"tc-cta\" data-twig-component=\"Cta-default\">\n  scientific research<br \/>\n<\/section>\n<\/li>\n<li class=\"c-tags-list__item\">\n<section class=\"tc-cta\" data-twig-component=\"Cta-default\">\n  Physics<br \/>\n<\/section>\n<\/li>\n<li class=\"c-tags-list__item\">\n<section class=\"tc-cta\" data-twig-component=\"Cta-default\">\n  China<br \/>\n<\/section>\n<\/li>\n<li class=\"c-tags-list__item\">\n<section class=\"tc-cta\" data-twig-component=\"Cta-default\">\n  Albert Einstein<br \/>\n<\/section>\n<\/li>\n<\/ul>\n<\/div>\n<\/div>\n<div class=\"tp-vuukle\">\n<div class=\"c-vuukle-skeleton\" aria-hidden=\"true\">\n<div class=\"c-vuukle-skeleton__header\"><span class=\"c-vuukle-skeleton__title\">Comments<\/span><\/div>\n<\/div>\n<\/div>\n<\/div>\n<aside class=\"o-article-newsy__aside\">\n<div class=\"c-ad-wrapper o-article-newsy__aside__content-1\" data-ad-name=\"adzone-halfpage\">\n<div class=\"c-ad c-ad-halfpage u-show-for-desktop\">\n<div class=\"c-ad__placeholder\"><img loading=\"lazy\" decoding=\"async\" class=\"c-ad__placeholder__logo\" src=\"https:\/\/www.euronews.com\/images\/logos\/logo-euronews-stacked-outlined-72x72-grey-9.svg\" width=\"72\" height=\"72\" alt><span>ADVERTISEMENT<\/span><\/div>\n<\/div>\n<div class=\"c-ad u-show-for-mobile-only\">\n<div class=\"c-ad__placeholder\"><img loading=\"lazy\" decoding=\"async\" class=\"c-ad__placeholder__logo\" src=\"https:\/\/www.euronews.com\/images\/logos\/logo-euronews-stacked-outlined-72x72-grey-9.svg\" width=\"72\" height=\"72\" alt><span>ADVERTISEMENT<\/span><\/div>\n<\/div>\n<\/div>\n<div id=\"adb-article-top-stories\" class=\"perf-cv-auto c-top-stories\">\n<h2 class=\"c-top-stories__title\">Top stories<\/h2>\n<div class=\"c-top-stories__item\">\n<article id=\"abe-2940718-pos2-top-stories\" class=\"the-media-object m-modeMobile-2 m-modeDesktop-2 the-media-object--no-label\" data-nid=\"2940718\" data-cid=\"9986843\" data-part-label=\"Partner content\">\n<figure id=\"abe-2940718-label-pos2-top-stories\" class=\"the-media-object__figure\"><img decoding=\"async\" class=\"the-media-object__image\" src=\"https:\/\/images.euronews.com\/articles\/stories\/09\/98\/68\/43\/320x180_cmsv2_82ab1228-940e-533c-bedd-193b322b2e1b-9986843.jpg\" loading=\"lazy\" alt=\"Source: AP Photo\" height=\"9\" width=\"16\"><\/figure>\n<div class=\"the-media-object__content\">\n<h3 class=\"the-media-object__title  \">\n<p>    Macron wants AI banned wherever it threatens children<br \/>\n  <\/h3>\n<\/div>\n<\/article>\n<\/div>\n<div class=\"c-top-stories__item\">\n<article id=\"abe-2940557-pos3-top-stories\" class=\"the-media-object m-modeMobile-2 m-modeDesktop-2 the-media-object--has-video the-media-object--no-label\" data-nid=\"2940557\" data-cid=\"9986061\" data-part-label=\"Partner content\">\n<figure id=\"abe-2940557-label-pos3-top-stories\" class=\"the-media-object__figure\"><img decoding=\"async\" class=\"the-media-object__image\" src=\"https:\/\/images.euronews.com\/articles\/stories\/09\/98\/03\/60\/320x180_cmsv2_703f52a9-6b6e-51d5-83d8-0f6c3d0aef14-9980360.jpg\" loading=\"lazy\" alt=\"A woman shops in the refrigerated section of a supermarket two days after the cyberattack on several French supermarkets in Montreuil, France, 14 October 2026. \" height=\"9\" width=\"16\"><\/figure>\n<div class=\"the-media-object__content\">\n<h3 class=\"the-media-object__title  \">\n<p>    France says Iran behind cyberattacks on supermarket fridges<br \/>\n  <\/h3>\n<\/div>\n<\/article>\n<\/div>\n<div class=\"c-top-stories__item\">\n<article id=\"abe-2940554-pos4-top-stories\" class=\"the-media-object m-modeMobile-2 m-modeDesktop-2 the-media-object--no-label\" data-nid=\"2940554\" data-cid=\"9986032\" data-part-label=\"Partner content\">\n<figure id=\"abe-2940554-label-pos4-top-stories\" class=\"the-media-object__figure\"><img decoding=\"async\" class=\"the-media-object__image\" src=\"https:\/\/images.euronews.com\/articles\/stories\/09\/98\/60\/32\/320x180_cmsv2_85f1385e-a553-59e0-844b-235e31453d9e-9986032.jpg\" loading=\"lazy\" alt=\"9 November 2026; Agibot A3 robots on Centre Stage during Opening Night of Web Summit 2026 at the MEO Arena in Lisbon, Portugal.\" height=\"9\" width=\"16\"><\/figure>\n<div class=\"the-media-object__content\">\n<h3 class=\"the-media-object__title  \">\n<p>    Robots, AI agents and a Nvidia probe: Web Summit 2026 Opens in Lisbon<br \/>\n  <\/h3>\n<\/div>\n<\/article>\n<\/div>\n<div class=\"c-top-stories__item\">\n<article id=\"abe-2940530-pos5-top-stories\" class=\"the-media-object m-modeMobile-2 m-modeDesktop-2 the-media-object--no-label\" data-nid=\"2940530\" data-cid=\"9985787\" data-part-label=\"Partner content\">\n<figure id=\"abe-2940530-label-pos5-top-stories\" class=\"the-media-object__figure\"><img decoding=\"async\" class=\"the-media-object__image\" src=\"https:\/\/images.euronews.com\/articles\/stories\/09\/98\/57\/87\/320x180_cmsv2_fcb95d20-5f38-5a6e-917e-be39a88aecb9-9985787.jpg\" loading=\"lazy\" alt=\"The EU will announce its proposal for the Digital Fairness Act on Wednesday.\" height=\"9\" width=\"16\"><\/figure>\n<div class=\"the-media-object__content\">\n<h3 class=\"the-media-object__title  \">\n<p>    EU to blacklist ten online design &#8216;traps&#8217;, leaked draft shows<br \/>\n  <\/h3>\n<\/div>\n<\/article>\n<\/div>\n<div class=\"c-top-stories__item\">\n<article id=\"abe-2940317-pos6-top-stories\" class=\"the-media-object m-modeMobile-2 m-modeDesktop-2 the-media-object--has-video the-media-object--no-label\" data-nid=\"2940317\" data-cid=\"9984818\" data-part-label=\"Partner content\">\n<figure id=\"abe-2940317-label-pos6-top-stories\" class=\"the-media-object__figure\"><img decoding=\"async\" class=\"the-media-object__image\" src=\"https:\/\/images.euronews.com\/articles\/stories\/09\/95\/79\/93\/320x180_cmsv2_f8f8ae3f-86d3-5649-a459-de8b6dc96175-9957993.jpg\" loading=\"lazy\" alt=\"Nvidia CEO Jensen Huang listens as President Donald Trump speaks during an event at the U.S. Institute of Peace, Oct. 8, 2026, in Washington.\" height=\"9\" width=\"16\"><\/figure>\n<div class=\"the-media-object__content\">\n<h3 class=\"the-media-object__title  \">\n<p>    Nvidia investigates CEO Jensen Huang&#8217;s affair with alleged Beijing spy<br \/>\n  <\/h3>\n<\/div>\n<\/article>\n<\/div>\n<\/div>\n<div class=\"perf-cv-auto c-ad-wrapper o-article-newsy__aside__content-2\" data-ad-name=\"adzone-halfpage\">\n<div class=\"c-ad c-ad-halfpage u-show-for-desktop\">\n<div class=\"c-ad__placeholder\"><img loading=\"lazy\" decoding=\"async\" class=\"c-ad__placeholder__logo\" src=\"https:\/\/www.euronews.com\/images\/logos\/logo-euronews-stacked-outlined-72x72-grey-9.svg\" width=\"72\" height=\"72\" alt><span>ADVERTISEMENT<\/span><\/div>\n<\/div>\n<div class=\"c-ad u-show-for-mobile-only\">\n<div class=\"c-ad__placeholder\"><img loading=\"lazy\" decoding=\"async\" class=\"c-ad__placeholder__logo\" src=\"https:\/\/www.euronews.com\/images\/logos\/logo-euronews-stacked-outlined-72x72-grey-9.svg\" width=\"72\" height=\"72\" alt><span>ADVERTISEMENT<\/span><\/div>\n<\/div>\n<\/div>\n<div class=\"perf-cv-auto c-most-viewed\">\n<h2 class=\"c-most-viewed__title qa-section-title\">Most read<\/h2>\n<div class=\"c-most-viewed__list\">\n<div class=\"c-most-viewed__item\"><span class=\"c-most-viewed__item__number\">1<\/span><\/p>\n<article id=\"abe-2940399-pos1-mostViewed\" class=\"the-media-object m-modeMobile-3 m-modeDesktop-3 the-media-object--has-video the-media-object--has-related the-media-object--no-label\" data-nid=\"2940399\" data-cid=\"9985178\" data-part-label=\"Partner content\">\n<div class=\"the-media-object__content\">\n<h3 class=\"the-media-object__title  \">\n<p> 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the-media-object--no-label\" data-nid=\"2940317\" data-cid=\"9984818\" data-part-label=\"Partner content\">\n<div class=\"the-media-object__content\">\n<h3 class=\"the-media-object__title  \">\n<p>    Nvidia investigates CEO Jensen Huang&#8217;s affair with alleged Beijing spy<br \/>\n  <\/h3>\n<\/div>\n<\/article>\n<\/div>\n<\/div>\n<\/div>\n<div class=\"perf-cv-auto c-ad-wrapper o-article-newsy__aside__content-3\" data-ad-name=\"adzone-halfpage\">\n<div class=\"c-ad c-ad-halfpage u-show-for-desktop\">\n<div class=\"c-ad__placeholder\"><img loading=\"lazy\" decoding=\"async\" class=\"c-ad__placeholder__logo\" src=\"https:\/\/www.euronews.com\/images\/logos\/logo-euronews-stacked-outlined-72x72-grey-9.svg\" width=\"72\" height=\"72\" alt><span>ADVERTISEMENT<\/span><\/div>\n<\/div>\n<div class=\"c-ad u-show-for-mobile-only\">\n<div class=\"c-ad__placeholder\"><img loading=\"lazy\" decoding=\"async\" class=\"c-ad__placeholder__logo\" src=\"https:\/\/www.euronews.com\/images\/logos\/logo-euronews-stacked-outlined-72x72-grey-9.svg\" width=\"72\" height=\"72\" alt><span>ADVERTISEMENT<\/span><\/div>\n<\/div>\n<\/div>\n<\/aside>\n<\/div>\n<\/article>\n<article id=\"abe-2939249-pos0-c-article-you-might-also-like__item\" class=\"the-media-object m-modeMobile-1 m-modeDesktop-1 the-media-object--has-video\" data-nid=\"2939249\" data-cid=\"9979743\" data-part-label=\"Partner content\">\n<figure id=\"abe-2939249-label-pos0-c-article-you-might-also-like__item\" class=\"the-media-object__figure\"><img decoding=\"async\" class=\"the-media-object__image\" src=\"https:\/\/images.euronews.com\/articles\/stories\/09\/97\/97\/43\/480x270_cmsv2_821ec6a9-84e6-58e0-96a2-69cc47507e8d-9979743.jpg\" loading=\"lazy\" alt=\"Photo\" height=\"9\" width=\"16\"><\/figure>\n<div class=\"the-media-object__content\">\n                    Tech News<\/p>\n<h3 class=\"the-media-object__title  \">\n<p>    \u2018Zeptoverse\u2019: CERN scientists uncover 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Agibot A3 robots on Centre Stage during Opening Night of Web Summit 2026 at the MEO Arena in Lisbon, Portugal.\" height=\"9\" width=\"16\"><\/figure>\n<div class=\"the-media-object__content\">\n<h3 class=\"the-media-object__title  \">\n<p>    Robots, AI agents and a Nvidia probe: Web Summit 2026 Opens in Lisbon<br \/>\n  <\/h3>\n<\/div>\n<\/article>\n<article id=\"abe-2940530-pos5-top-stories\" class=\"the-media-object m-modeMobile-2 m-modeDesktop-2 the-media-object--no-label\" data-nid=\"2940530\" data-cid=\"9985787\" data-part-label=\"Partner content\">\n<figure id=\"abe-2940530-label-pos5-top-stories\" class=\"the-media-object__figure\"><img decoding=\"async\" class=\"the-media-object__image\" src=\"https:\/\/images.euronews.com\/articles\/stories\/09\/98\/57\/87\/320x180_cmsv2_fcb95d20-5f38-5a6e-917e-be39a88aecb9-9985787.jpg\" loading=\"lazy\" alt=\"The EU will announce its proposal for the Digital Fairness Act on Wednesday.\" height=\"9\" width=\"16\"><\/figure>\n<div class=\"the-media-object__content\">\n<h3 class=\"the-media-object__title  \">\n<p>    EU to blacklist ten online design &#8216;traps&#8217;, leaked draft shows<br \/>\n  <\/h3>\n<\/div>\n<\/article>\n<article id=\"abe-2940317-pos6-top-stories\" class=\"the-media-object m-modeMobile-2 m-modeDesktop-2 the-media-object--has-video the-media-object--no-label\" data-nid=\"2940317\" data-cid=\"9984818\" data-part-label=\"Partner content\">\n<figure id=\"abe-2940317-label-pos6-top-stories\" class=\"the-media-object__figure\"><img decoding=\"async\" class=\"the-media-object__image\" src=\"https:\/\/images.euronews.com\/articles\/stories\/09\/95\/79\/93\/320x180_cmsv2_f8f8ae3f-86d3-5649-a459-de8b6dc96175-9957993.jpg\" loading=\"lazy\" alt=\"Nvidia CEO Jensen Huang listens as President Donald Trump speaks during an event at the U.S. Institute of Peace, Oct. 8, 2026, in Washington.\" height=\"9\" width=\"16\"><\/figure>\n<div class=\"the-media-object__content\">\n<h3 class=\"the-media-object__title  \">\n<p>    Nvidia investigates CEO Jensen Huang&#8217;s affair with alleged Beijing spy<br \/>\n  <\/h3>\n<\/div>\n<\/article>\n<article id=\"abe-2940399-pos1-mostViewed\" class=\"the-media-object m-modeMobile-3 m-modeDesktop-3 the-media-object--has-video the-media-object--has-related the-media-object--no-label\" data-nid=\"2940399\" data-cid=\"9985178\" data-part-label=\"Partner content\">\n<div class=\"the-media-object__content\">\n<h3 class=\"the-media-object__title  \">\n<p>    Who is Alice Huang, the alleged Chinese spy linked to Nvidia&#8217;s Jensen Huang?<br \/>\n  <\/h3>\n<\/div>\n<\/article>\n<article id=\"abe-2797468-pos2-mostViewed\" class=\"the-media-object m-modeMobile-3 m-modeDesktop-3 the-media-object--no-label\" data-nid=\"2797468\" data-cid=\"9267924\" data-part-label=\"Partner content\">\n<div class=\"the-media-object__content\">\n<h3 class=\"the-media-object__title  \">\n<p>    Spain moves forward with plans to shorten the 40-hour working week<br \/>\n  <\/h3>\n<\/div>\n<\/article>\n<article id=\"abe-2940530-pos3-mostViewed\" class=\"the-media-object m-modeMobile-3 m-modeDesktop-3 the-media-object--has-related the-media-object--no-label\" data-nid=\"2940530\" data-cid=\"9985787\" data-part-label=\"Partner content\">\n<div class=\"the-media-object__content\">\n<h3 class=\"the-media-object__title  \">\n<p>    EU to blacklist ten online design &#8216;traps&#8217;, leaked draft shows<br \/>\n  <\/h3>\n<\/div>\n<\/article>\n<article id=\"abe-2939305-pos4-mostViewed\" class=\"the-media-object m-modeMobile-3 m-modeDesktop-3 the-media-object--has-related the-media-object--no-label\" data-nid=\"2939305\" data-cid=\"9980046\" data-part-label=\"Partner content\">\n<div class=\"the-media-object__content\">\n<h3 class=\"the-media-object__title  \">\n<p>    Physicist claims time travel can only take us to the future<br \/>\n  <\/h3>\n<\/div>\n<\/article>\n<article id=\"abe-2940317-pos5-mostViewed\" class=\"the-media-object m-modeMobile-3 m-modeDesktop-3 the-media-object--has-video the-media-object--has-related the-media-object--no-label\" data-nid=\"2940317\" data-cid=\"9984818\" data-part-label=\"Partner content\">\n<div class=\"the-media-object__content\">\n<h3 class=\"the-media-object__title  \">\n<p>    Nvidia investigates CEO Jensen Huang&#8217;s affair with alleged Beijing spy<br \/>\n  <\/h3>\n<\/div>\n<\/article>\n<div class=\"articleBody\" data-key=\"articleBody\">A question many of us have posed in our minds is where would you go if you had a time machine?Would you head for the year 3000 to see what has become of the human race? Or would you crank the dial backwards like Marty McFly and risk sabotaging your own future? Before you start packing, a physicist has some news that may ruin a few Marvel movies: you may only be able to go one way, and it isn&#8217;t backwards.Hongsheng Zhang, a researcher at the University of Jinan in China, has shown that in a broad class of theoretical universes, travelling into your own past is impossible.The whole argument rests on one fact: &#8220;light can never point sideways to a traveller&#8217;s direction in time,&#8221; Zhang says.Imagine spacetime sliced into layers that light itself can travel along. Anything moving slower than light must cross these surfaces in the same direction, like climbing a staircase that never lets you step down.If you can only ever go up, you can never arrive back on the step where you started.&#8221;My paper asks a narrower question: when does a spacetime permit such a loop, and when does the geometry itself forbid one?&#8221; Zhang told Euronews Next.The two loopholesPhysicists call journeys to the past &#8220;closed timelike curves&#8221;: routes through spacetime that loop back to the very place and moment they began.&#8221;Suppose you wanted to shake hands with your younger self,&#8221; Zhang says. &#8220;To do that you would need a path through spacetime that loops back on itself without ever exceeding the speed of light.&#8221;Einstein&#8217;s equations allow such paths in a handful of scenarios, such as near the core of a spinning black hole.Crucially, Zhang&#8217;s research, which has been submitted for peer review, also reveals exactly how a time machine could get around it, and there are only two ways.The first is twist. Imagine light rays that, instead of travelling side by side, spiral around one another like the strands of a rope. When that happens, the neat surfaces of light can&#8217;t form, so there is no staircase to keep you climbing.This is what happens near the centre of a spinning black hole. Einstein&#8217;s theory says a spinning mass drags space and time around with it, and close to the black hole&#8217;s core the drag is so strong that moving &#8220;forward in time&#8221; is bent into a circle.A traveller following that circle would see their clock ticking forward in time as normal, yet their journey would arrive back at the moment they set off. Physicist Brandon Carter showed in 1968 that such loops exist inside spinning black holes.But Zhang stresses that twist alone is not the culprit. &#8220;Twist on its own does not create a closed curve. It only blocks my argument,&#8221; Zhang says. &#8220;Twist is everywhere in the universe and, as far as we know, harmless.&#8221;The second is the shape of the universe itself. The staircase might be perfectly built, but it could lead around the sides of a building, so the top step leads straight back to the bottom, like the impossible staircases in an Escher drawing. You would keep climbing and still end up where you began. Most of the time machines physicists have designed on paper, including those built from wormholes, rely on this trick.Physicists call this loophole topology, and Zhang believes it is the one to watch. &#8220;The loophole that could matter is topology, and that is exactly the one that looks least likely to arise without deliberate engineering,&#8221; Zhang says.Destination: tomorrowTrips to the future, by contrast, are already well established. Einstein showed that moving very fast, or sitting in strong gravity, slows your clock relative to everyone else&#8217;s. Astronauts returning from six months aboard the International Space Station are about five thousandths of a second younger than they would otherwise have been, according to the European Space Agency.Zhang is keen to stress the limits of the work. &#8220;This is not a claim that time travel is impossible,&#8221; Zhang says.For now, though, you may want to pack for tomorrow rather than yesterday&#8230; unless you have the Time Stone, of course.<\/div>\n<p>[analyse_source url=&#8221;https:\/\/www.euronews.com\/2026\/11\/09\/where-would-you-go-in-a-time-machine-physicist-says-time-travel-only-goes-forward&#8221;]<\/p>\n","protected":false},"excerpt":{"rendered":"<p>[analyse_image type=&#8221;featured&#8221; src=&#8221;https:\/\/images.euronews.com\/articles\/stories\/09\/98\/00\/46\/1200x675_cmsv2_2489eaeb-b835-512d-97d4-ea4e62629349-9980046.jpg&#8221;] Business Central Asia&#8217;s first wind-and-battery project nears completion No Comment Aerial footage reveals devastation after deadly Bulgaria highway crash Europe News Portugal on alert as storm Charles brings red warnings to Madeira Europe News Five EU countries demand UK pays for electricity market access Next Tech News No going back: physicist\u2019s proof [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[90],"tags":[226,36],"class_list":["post-2248171","post","type-post","status-publish","format-standard","hentry","category-international","tag-crawlmanager","tag-euronews-com"],"_links":{"self":[{"href":"https:\/\/analyse.optim.biz\/index.php?rest_route=\/wp\/v2\/posts\/2248171","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/analyse.optim.biz\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/analyse.optim.biz\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/analyse.optim.biz\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/analyse.optim.biz\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=2248171"}],"version-history":[{"count":0,"href":"https:\/\/analyse.optim.biz\/index.php?rest_route=\/wp\/v2\/posts\/2248171\/revisions"}],"wp:attachment":[{"href":"https:\/\/analyse.optim.biz\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=2248171"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/analyse.optim.biz\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=2248171"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/analyse.optim.biz\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=2248171"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}