#spacetime
Richard Feynman Explains: Why the Past Isn’t Really Gone.
🌌Ever felt like the past is just a fading memory? Richard Feynman and modern physics say otherwise.
We’re taught that time flows like a river, leaving the past in the dust. But what if \.
Studying the thing you can never step outside of and look back at is the fundamental problem facing every cosmologist who has ever looked up at the night sky. The Universe is not a laboratory you can peer into from above, it’s the thing you are already inside. The only way to truly test your ideas about how it works is to build a copy of it, run the clock forward from the Big Bang, and see if what emerges matches what your telescopes are actually telling you.
That is exactly what the FLAMINGO project has been doing. And this week, its creators made the results available to the entire world.
An international team of astrophysicists, led by researchers at Leiden University in the Netherlands, has released one of the largest cosmological simulation datasets ever produced. The archive contains more than 2.5 petabytes of data (roughly equivalent to half a million high definition films) and is free to access for researchers anywhere on the planet.
The concept of spacetime, first described in Einstein’s theory of general relativity, has since been widely studied by many physicists worldwide. Spacetime is described mathematically as a four-dimensional (4D) continuum in which physical events occur, which merges three-dimensional (3D) space, with one-dimensional (1D) time.
This 4D continuum is known to continuously evolve following complex and intricate patterns that are governed by Einstein’s field equations; mathematical equations that describe how matter and energy shape spacetime. While various past theoretical studies explored the evolution of spacetime, identifying patterns that persist during its evolution has proved challenging so far.
Researchers at Adolfo Ibáñez University in Chile and Columbia University set out to explore the evolution of spacetime using ideas rooted in nonlinear electrodynamics, an area of physics that studies the behavior of electric and magnetic fields in complex materials.
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The Fermi Paradox is the question of why we haven’t been contacted by any extraterrestrial species. In a recent paper, astrophysicists analyzed the paradox by instead examining how civilizations with the ability to send signals through space might develop. Unfortunately for us, their findings are quite bleak – but let’s take a look anyway.
Paper: https://arxiv.org/abs/2602.
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This video discusses the Fermi Paradox, questioning the absence of extraterrestrial life despite the vastness of the cosmos. The Milky Way has had billions of years to produce civilizations, so where is everybody? A new paper’s analysis suggests a concerning conclusion regarding this silence, prompting us to consider what the lack of alien life tells us about our universe. 🔭
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Hello and welcome! My name is Anton and in this video, we will talk about the first ever antimatter transportation using a truck
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The biggest news in cosmology in recent years is that the mysterious universe-accelerating entity we call dark energy may be fading away. The evidence for this is now strong enough that enormous effort is going into confirming this result. So what’s it going to take, and when are we going to know?
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You are used to thinking of time as a straight line: past behind you, present under your feet, and future stretching endlessly ahead. Clocks tick, calendars flip, and your life seems to march forward in one clean direction. But when you start looking closely at what physics and philosophy actually say about time, that simple picture starts to wobble in surprising and sometimes unsettling ways.
Once you let go of the idea that time must be linear, a whole new universe of possibilities opens up. You begin to wonder whether the past is really gone, whether the future might already exist, and whether your sense of “now” is just a useful illusion. In this article, you’ll explore some of the strangest, most well-supported ideas about time from modern science, and you’ll see how they quietly challenge your everyday experience without requiring you to believe in magic.
If you pause and ask yourself what “now” actually is, you probably feel like the answer is obvious: it’s the present moment you’re living in. But when you compare your “now” with someone else’s “now” far away, the certainty starts to crack. Relativity theory tells you that what counts as “simultaneous” events depends on how you’re moving, so two observers in different states of motion won’t agree on what is happening at the same time.
For the first time, a research team has demonstrated, in a metal-wall environment, a plasma regime that simultaneously achieves partial divertor detachment, an edge-localized-mode (ELM)-free high-confinement mode (H-mode), and high pedestal performance. This integrated regime was sustained on a minute scale and the work is published in Physical Review Letters.
The team was led by Professor Xu Guosheng from the Institute of Plasma Physics, Hefei Institutes of Physical Science, Chinese Academy of Sciences.
Controllable nuclear fusion requires managing extreme heat loads on divertor plates while maintaining plasma stability. While impurity gases can reduce divertor heat through detachment, excessive cooling can damage the plasma edge, and H-mode plasmas are prone to sudden, damaging ELMs. Achieving a steady-state regime that addresses both challenges has been a major international goal.
In this Presidential Lecture, Netta Engelhardt will (metaphorically!) dive straight into the black hole interior to explain the origin of this puzzle and its significance in modern physics. The lecture will then turn to the recent revolution in physicists’ understanding of the black hole information paradox and the current state of the resolution. She will conclude with a discussion of where these new insights may lead, what questions remain outstanding and how this may all fit into the universe at large.
Where exactly is the edge of the Milky Way? That question is harder to answer than one might expect. Since we’re inside of the galaxy itself, it’s obviously hard to judge the “edge” to begin with. But it gets even more complicated when defining what the edge even is — the galaxy simply gets less dense the farther away from the center it goes. A new paper by researchers originally at the University of Malta thinks they have an answer though. The “edge” can be defined as the star-forming region, and in their paper, published in Astronomy & Astrophysics, they very clearly show that “edge” to be between 11.28 and 12.15 kiloparsecs (or about 40,000 light years) from the center.
Even finding that edge was no easy task, though. The researchers had to analyze the ages of over 100,000 giant stars from the data of several different surveys, including APOGEE-DR17, LAMOST-DR3 and Gaia. In the data they found an interesting story about the evolution of the position of stars in the galaxy, and their age.
That relationship can be thought of as a U curve. In this case, the Y axis is age, and the X axis is the distance from the galaxy’s center. A picture (or graph in this case) is worth a thousand words, but in words that simply means that stars closer to the center of the galaxy are older, and get progressively younger out to a certain point, and then start getting older again. That “certain point”, according to the authors, is the end of the galaxy’s star-forming region, and hence, the “edge” of the galaxy.