Housebound? This map lets you travel through time
Interactive globe shows where your hometown was at various stages of Earth's deep geological past.
17 October, 2020
Image: Ancient Earth Globe, reproduced with kind permission.
- If you love travelling, a pandemic like this is not the greatest of times.
- But here's a way to go somewhere else without even leaving the house.
- This interactive tool lets you travel up to 750 million years back in time.
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Travels in the fourth dimension
<img type="lazy-image" data-runner-src="https://assets.rebelmouse.io/eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.eyJpbWFnZSI6Imh0dHBzOi8vYXNzZXRzLnJibC5tcy8yNDUyNTI1Ni9vcmlnaW4uanBnIiwiZXhwaXJlc19hdCI6MTY1NjM5NjY5OX0.l5xmIbvn6QtGwzC6zg2GJWWfjc-N4pAHGhaF7JGOWxE/img.jpg?width=980" id="10f9f" class="rm-shortcode" data-rm-shortcode-id="eb5f583d74333bece3f7e1f95dff6145" data-rm-shortcode-name="rebelmouse-image" alt="" data-width="2700" data-height="900" />Image: Ancient Earth Globe, reproduced with kind permission.
<p><em>Berlin in deep time. Left to right: in the Neocene Period (20 million years ago), Berlin is on a vast plain that includes what would become the Baltic Sea; in the Devonian (400 million years ago), it's on the southern edge of a turtle-shaped continent; and in the Ordovician (470 million years ago), Berlin is on an island south of what was to become, many millions of years later, the Black Sea.</em></p><p>No matter where in the world you are, the virus continues to be out there somewhere, as keen as ever on making your acquaintance. The best policy remains: avoid contact with others, avoid unnecessary travel. In short: we're all stuck at home a whole lot more than we'd like to. </p><p><span></span>After the better part of a year spent under various forms of lockdowns and other restrictions, many are suffering from an increasingly itchy version of <em>wanderlust</em> – the urge to travel – and it's becoming harder and harder not to scratch. </p><p>Here's an interesting alternative: instead of traveling through space, why not stay put in the first three dimensions and travel through the fourth one instead? It's a trick performed to great acclaim by H.G. Wells in "<a href="http://www.gutenberg.org/ebooks/35" target="_blank">The Time Machine</a>." <br></p><p>The protagonist in Wells' 1895 novella travels to the terrifying future populated by Eloi and Morlocks and even further forward to the final days of Earth, without having to leave the laboratory attached to his house.</p>750 million years into the past
<img type="lazy-image" data-runner-src="https://assets.rebelmouse.io/eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.eyJpbWFnZSI6Imh0dHBzOi8vYXNzZXRzLnJibC5tcy8yNDUyNTI2OC9vcmlnaW4uanBnIiwiZXhwaXJlc19hdCI6MTYzNDI3ODIxOX0.uFiLQ1OVzfnxyYXG2HBVQM69-9vr5JHpGZkU8frgQ2A/img.jpg?width=980" id="39f51" class="rm-shortcode" data-rm-shortcode-id="8e079cb759c93a8f114d37670e2ca922" data-rm-shortcode-name="rebelmouse-image" data-width="2701" data-height="900" />Image: Ancient Earth Globe, reproduced with kind permission.
<p><em>New York City through the ages. Left to right: Early Triassic (240 million years ago), in the middle of a megacontinent opposite future Morocco; Carboniferous (340 million years ago), still coastal, but mirrored – the ocean to the west, the land to the east; Late Ordovician (450 million years ago), near the tip of a very Long Island indeed.</em></p><p>And thanks to the <a href="https://dinosaurpictures.org/ancient-earth" target="_blank">Ancient Earth Globe</a>, you can now travel 750 million years in the other direction, also without leaving your house. You don't even need a lab; just go to the interactive map built by paleontologist Ian Webster. Here's how it works.<br></p><ul><li>Type in the name of your hometown.</li><li>Its coordinates are 'geolocked' onto the globe.</li><li>As you scroll through the past ages of the Earth, the continents shift shape and change place.</li><li>Watch the surroundings of your location modify accordingly. Now you're high up in the mountains. And now you're getting your feet wet in the middle of a nameless ocean. </li></ul>There are several ways to navigate the deep past presented by the Ancient Earth Globe.<ul><li>From the drop-down menu on top, you can pick one of 25 specific times, from zero to 750 million years ago.</li><li>Or pull one of 19 significant events from the menu on the right-hand side: the time of the first dinosaurs or the first flowers, the time of the supercontinents of Pangaea or Pannotia, the Jurassic or Cretaceous era.</li><li>Or you can time-travel casual style, by using the left and right arrows on your keyboard to flip through prehistory. </li></ul>The map of the world isn't 'fixed'
<img type="lazy-image" data-runner-src="https://assets.rebelmouse.io/eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.eyJpbWFnZSI6Imh0dHBzOi8vYXNzZXRzLnJibC5tcy8yNDUyNTI3OS9vcmlnaW4uanBnIiwiZXhwaXJlc19hdCI6MTY2OTA3ODQzM30.ANPjkSMiQWfrVNsoAE5DeO6nAWrzVrBgaPRR7FyAQ8E/img.jpg?width=980" id="f17d9" class="rm-shortcode" data-rm-shortcode-id="17df49844a4d2fb9481c6d147946e084" data-rm-shortcode-name="rebelmouse-image" data-width="2700" data-height="900" />Image: Ancient Earth Globe, reproduced with kind permission.
<p><em>Time travel in Buenos Aires. Left to right: Late Jurassic (150 million years ago), glued to Southern Africa; Carboniferous (340 million years ago), in the middle of a giant bay; Silurian (430 million years ago), on the north shore of a large continent, facing a Hawaiian-like chain of islands.</em></p><p>The purpose of the Ancient Earth Globe is to provide its users with an appreciation of the dynamic nature of our planet's appearance. The map of the world that we experience as 'fixed' is anything but. The tectonic forces that shift, split and collide entire continents are constantly at work. Except that our lives are too short to really experience the changes they bring about.</p><p>But go back far enough into the past, and what's familiar becomes strange. Dry land transforms into ocean floor. Seaside towns move to the middle of strange continents. Cold climes turn tropical, and vice versa. Imagining such exotic pasts may not be the same as actually going there. But it sure beats watching the news in this Groundhog Day of a year. </p><p><em><br></em></p><p><span></span><em>Images from the Ancient Earth Globe reproduced with kind permission by Ian Webster</em></p><p><em></em><strong>Strange Maps #1052</strong></p><p><strong></strong><em>Got a strange map? Let me know at </em><a href="mailto:strangemaps@gmail.com">strangemaps@gmail.com</a><em>.</em></p>
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Or is it?
The post The Future Is Wide Open appeared first on ORBITER.
New controversial theory: Past, present, future exist simultaneously
Our experience of time may be blinding us to its true nature, say scientists.
23 September, 2018
Back to the Future.
- Time may not be passing at all, says the Block Universe Theory.
- Time travel may be possible.
- Your perception of time is likely relative to you and limited.
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<p>We seem to perceive time as passing in one direction. After all, we can't just just forward to the future or revisit our past if we felt like it. Every minute of every day appears to move us ahead, pulling us through our lives towards an inexorable demise. At least that's what the conventional experience of time tells us. But what if your present, past, and future all existed already? Time, from that point of view, would not flow.</p><p><strong>The block universe theory</strong> says that our universe may be looked at as a giant four-dimensional block of spacetime, containing all the things that ever happen, <a href="http://www.abc.net.au/news/science/2018-09-02/block-universe-theory-time-past-present-future-travel/10178386" target="_blank">explained</a><strong> Dr. Kristie Miller, </strong>the joint director for the <a href="https://sydney.edu.au/arts/our-research/centres-institutes-and-groups/centre-for-time.html" target="_blank">Centre for Time</a> at the University of Sydney.</p><p>In the block universe, there is no "now" or present. All moments that exist are just relative to each other within the three spacial dimensions and one time dimension. Your sense of the present is just reflecting where in the block universe you are at that instance. The "past" is just a slice of the universe at an earlier location while the "future" is at a later location.</p>
<p>So, is time just an elaborate mind trick? And more importantly - is time travel possible?</p><p>Dr. Miller's answer to that is "yes". Of course, just hypothetically, since we'd need to figure out first how to travel at "some reasonable percentage of the speed of light". Going to the past would entail using <a href="https://www.space.com/20881-wormholes.html" target="_blank">wormholes</a>, like "short cuts through space-time".</p>
<p><br><br></p><p><img src="https://assets.rbl.ms/18650985/980x.jpg"> <small>Block Universe diagram.</small><small>Credit: ABC Science</small></p>
<p>Now, if you did manage to get back in time, you won't be able to change it. This is because your past is always simultaneously someone else's future. So if you travel to the past, you're just making that future the way it is. So don't worry about <a href="http://timetravelphilosophy.net/topics/grandfather/" target="_blank">"grandfather paradoxes"</a> - your time machine has already been incorporated into the scheme of things.</p><blockquote>'If I travel to the past, I am part of the past," <a href="http://www.abc.net.au/news/science/2018-09-02/block-universe-theory-time-past-present-future-travel/10178386" target="_blank">said Miller.</a> "Importantly, I was always part of the past."</blockquote>
<p>What's more - maybe the past has already been altered by time travelers. How would we be able to tell if it hasn't? <em>"For all we know, the reason the past is the way it is, is in part due to the presence of time travelers," added Miller.</em><br></p><p>By that logic, what you do tomorrow will make it the way it is, with you fulfilling a certain destiny writ in time, which is in itself more of an illusion than a fundamental property of nature.</p><p>Certainly, with such claims, the block universe theory has its detractors. One big criticism is that the future shouldn't exist yet. Physicist <strong>Lee Smolin</strong> <a href="https://www.quantamagazine.org/a-debate-over-the-physics-of-time-20160719/" target="_blank">wrote</a> that <em>"The future is not now real and there can be no definite facts of the matter about the future." </em>Furthermore, as he <a href="https://www.quantamagazine.org/a-debate-over-the-physics-of-time-20160719/" target="_blank">added</a> at a 2017 conference, what is real is just "the process by which future events are generated out of present events."</p>
<p>Another negative of this idea is if the block universe is static, what is the point of anything? Can you have progress? Answering that is the "evolving block universe" model which sees the block of the universal space-time growing rather than staying the same. The surface of such a volume would represent the present moment. It's when<em> "the indefiniteness of the future changes to the definiteness of the past,"</em> as <a href="https://www.quantamagazine.org/a-debate-over-the-physics-of-time-20160719/" target="_blank">described</a> it cosmologist George Ellis. Under that model, the changing part would be the future. </p><p>While the debates are going to continue, the block universe theory is one of the most promising approaches that can reconcile the cosmological view of time with our everyday experience. What may be certain - time is much more than what it appears to be. Unraveling its mysteries is integral to understanding the human experience.</p>
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A new quantum theory predicts that the future could be influencing the past
A new study challenges what we understand about the workings of time.
09 July, 2017
credit: Pixabay
Quantum physics has spawned its share of strange ideas and hard-to-grasp concepts - from Einstein’s “spooky action at a distance” to the adventures of Shroedinger’s cat. Now a new study lends support to another mind-bender - the idea of retrocausality, which basically proposes that the future can influence the past and the effect, in essence, happens before the cause.
<p class="p1">At this point, retrocausality does not mean that you get to send signals from the future to the past - rather that an experimenter’s measurement of a particle can influence the properties of that particle in the past, even before making their choice.<span> </span></p> <p class="p1">The new paper argues that retrocausality could be a part of quantum theory. The scientists expound on the more traditionally accepted concept of <strong>time symmetry</strong> and show that if that is true, then so should be retrocausality. Time symmetry says that physical processes can run forward and backwards in time while being subject to the same physical laws.</p> <p class="p1">The scientists describe an experiment where time symmetry would require processes to have the same probabilities, whether they go backwards or forward in time. But that would cause a contradiction if there was no retrocausality, as it requires these processes to have different probabilities. What the paper shows is that you can’t have both concepts be true at the same time.</p> <p class="p1">Eliminating time symmetry would also get rid of some other sticky problems of quantum physics, like Einstein’s discomfort with entanglement which he described as “spooky action at a distance.” He saw challenges to quantum theory in the idea that entangled or connected particles could instantly affect each other even at large distances. In fact, accepting retrocausality could allow for a reinterpretation of Bell tests that were used to show evidence of “spooky action”. Instead, the tests could be supporting retrocausailty. </p> <p class="p1">The paper, published in the <a href="http://rspa.royalsocietypublishing.org/content/473/2202/20160607" target="_blank">Proceedings of the Royal Society A</a>, was authored by <a href="http://mattleifer.info/" target="_blank"><span class="s1">Matthew S. Leifer</span></a><span class="s1"> at Chapman University in California and Matthew F. Pusey at the Perimeter Institute for Theoretical Physics in Ontario. </span>The scientists hope their work can lead towards a fuller understanding of quantum theory.</p> <blockquote> <p class="p3"><span class="s2">"The reason I think that retrocausality is worth investigating is that we now have a slew of no-go results about realist interpretations of quantum theory, including Bell's theorem, Kochen-Specker, and recent proofs of the reality of the quantum state," <a href="https://phys.org/news/2017-07-physicists-retrocausal-quantum-theory-future.html" target="_blank">said Leifer to Phys.org.</a> "These say that any interpretation that fits into the standard framework for realist interpretations must have features that I would regard as undesirable. Therefore, the only options seem to be to abandon realism or to break out of the standard realist framework.”</span></p> </blockquote> <p class="p3"><span class="s2"> </span></p> <div class="video-full-card-placeholder" data-slug="george-musser-explains-spooky-action" style="border: 1px solid #ccc;">
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</div> <p><span class="s1">Are we going to have time travel as a result of this? In one idea proposed by Richard Feynman, </span>existence of retrocausality could mean that <strong>positrons,</strong> antimatter counterparts of electrons, would move backwards in time so that they could have a positive charge. If this was proven to be true, time travel could involve simply changing the direction of moving particles in the single dimension of time.</p> <p class="p6"><span class="s2">Leifer doesn’t go as far as time travel in his explanation, but speculates that if retrocausality does exist in the universe, then there could be evidence of it in the cosmological data, saying that “there are certain eras, perhaps near the big bang, in which there is not a definite arrow of causality.”</span> </p> <p class="p6"><span class="s2">Is this idea ready for the big time? It is supported by Huw Price, a philosophy professor at the University of Cambridge who focuses on the physics of time and is a leading advocate of retrocausality. Leifer and Pusey are taking things in stride, however, realizing that much more work needs to be done.</span> </p> <blockquote> <p class="p6"><span class="s2">"There is not, to my knowledge, a generally agreed upon interpretation of quantum theory that recovers the whole theory and exploits this idea. It is more of an idea for an interpretation at the moment, so I think that other physicists are rightly skeptical, and the onus is on us to flesh out the idea,” <a href="https://phys.org/news/2017-07-physicists-retrocausal-quantum-theory-future.html" target="_blank">said Leifer</a>.</span></p> </blockquote> <p class="p6"><span class="s2">There are no experiments underway by the physicists to test their theory, but they hope this work will question the assumptions of quantum mechanics and lead to new discoveries down the line.</span></p> <p class="p8"><a href="http://mattleifer.info/wordpress/wp-content/uploads/2016/08/Foundations20160717.pdf" target="_blank">You can read the study here.</a></p>
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Two Theories of Time, and What They Mean for Time Travel
When it comes to time, and what the heck it actually is, there's a clash of ideas between physics and neuroscience.
28 April, 2017
If you're here to indulge in some mind-bending talk about time travel, neuroscientist Dean Buonomano is about to break some hearts. He doesn't think it's plausible—but if it were, there is one hypothesis of the universe in which it could theoretically happen. There are currently two main ideas about time: Presentism—the notion is that only the present is real: the past happened, the future will happen, but only the present exists—and Eternalism, in which the past, present, and future are all equally real. If you want to flux-capacitor your way back in time, you'll want to hope that Eternalism turns out to be the true theory. It's known to physicists as Block Universe, where all moments of the past, present, and future are already laid out in a continuum—there are places to travel to. "Under Presentism we can pretty much take the possibility of time travel off the table because there’s no other moments to go to—only the present is real," says Buonomano.
<p>While there is certainly no consensus in the physics community, Eternalism is the standard view. And here is where the conflict with neuroscience begins. Buonomano presents the mutually exclusive ideas of the nature of time within the two fields, and explains why the disciplines need to have a meeting of the minds. Dean Buonomano is the author of <a href="http://www.indiebound.org/book/9780393247947"><i>Your Brain Is a Time Machine: The Neuroscience and Physics of Time</i></a>.</p><p><a href="http://www.indiebound.org/book/9780393247947"><img height="150" src="%5Cr%5Cnhttps://s3.amazonaws.com/edge-misc-assets/Book+Covers/Dean+Buonomano.jpg" width="225"></a></p>
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