Showing all posts about physics
Forget artificial intelligence, aliens may usurp humanity instead
8 April 2026
When people are in competition, they work harder if the game seems winnable, and decrease effort if they think they’ll lose. It’s implied that because humans are so far behind aliens, we are uncompetitive and so should put in less effort.
There’s — somehow — an idea, published on Marginal Revolution, that technologically advanced extraterrestrials have placed alien drone probes, which evade detection, across the solar system. These devices — if they exist — are apparently keeping an eye on what’s happening on Earth.
I even double checked the date the article was posted: Saturday 4 April 2026. So it wasn’t some sort of April Fool’s caper. On the other hand of course, Artemis II was on the way to the Moon by then.
The question though, what should we do if there are surveillance probes within the solar system? And who knows, maybe aliens are watching us. Maybe extraterrestrials indeed exist — there’s surely at least one intelligent alien civilisation somewhere in the universe — and they’ve found us.
But why they don’t make their presence known puzzles me. All those UAP sightings over the last several decades have somewhat given the show away, have they not? Let’s see you, not your incredible interstellar-space travel capable vessels.
But if we don’t want extraterrestrials to wipe us out, or simply stop us travelling beyond the limits of the solar system — things they may want to do — we need to lift our game. Work harder. Be more ambitious. Even if we remain uncompetitive in comparison. We also all need to work together.
If that’s possible. And if it’s not, I think that’s why they call it the great filter.
What a situation to be in.
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No sign of extraterrestrial life? Blame it on bad space weather
18 March 2026
In the search for evidence of intelligent extraterrestrial life, astronomers, and organisations like SETI, often seek out narrowband radio signals.
Space is full of radio signals, most of them broadband, which usually occur naturally. Neutron stars are but one generator of such signals. Narrowband radio transmissions, on the other hand, are somewhat more likely to be created by an intelligent civilisation. On Earth, for instance, TV transmissions and mobile phones, are among sources of narrowband radio signals.
It makes sense then to look out for such signals in deep space. But some recent research conducted by SETI suggests narrowband radio signals may be disrupted by chaotic flows of ionised gas, and other sources of turbulence in the cosmos:
A new study by researchers at the SETI Institute suggests stellar “space weather” could make radio signals from extraterrestrial intelligence harder to detect. Stellar activity and plasma turbulence near a transmitting planet can broaden an otherwise ultra-narrow signal, spreading its power across more frequencies and making it more difficult to detect in traditional narrowband searches.
We keep coming up with explanations to account for the apparent absence of intelligent extraterrestrial life elsewhere in the universe. Now we’re blaming the weather.
The smart money says there is intelligent life somewhere in the cosmos, but it may not be all that common, nor particularly close to us. There’s a lot of space out there, beyond the solar system.
The size of the galaxy, to say nothing of the universe, is something many of us struggle to comprehend. Even if humanity possessed the means to travel at speeds close to the velocity of light, it would take over four years just to reach Proxima Centauri, the star presently closest to the Sun.
To visit the centre of our galaxy, the journey would take over twenty-five thousand years.
That’s not insignificant. In fact, twenty-five thousand light years constitutes a vast amount of space. An alien civilisation could be tucked in there somewhere, but it might take thousands of years for evidence of their presence to become apparent.
On paper, the chances of the existence of intelligent extraterrestrial life are better than even.
There are potentially millions, if not more, of exoplanets with environments conducive to complex life in the Milky Way galaxy alone. And if intelligent life can take hold on Earth, it can surely take hold elsewhere. But there are those who think intelligent life on Earth is a fluke, and a lot of things had to go the right way, over a period of billions of years, for this to happen.
Bad “weather” in deep space may well be playing a part in concealing the presence of extraterrestrial technological civilisations. But their scarcity, and extreme distance — potentially tens of thousands of light years — from Earth, probably better explains why there is no sign, yet, of anyone else.
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Universe to astronomers: I am stranger than you imagine
4 December 2025
Kurzgesagt making sense of a non-sensical universe:
For decades, we’ve had a beautiful theory of the cosmos. One that explained how the universe began, what it’s made of, and how it’s supposed to behave. It matched our observations astonishingly well and made us feel like we’d almost deciphered the cosmic code. But in the last few years, as our telescopes got better and our data sharper, cracks started to appear. Strange mismatches between what the theory predicted and what we actually saw.
British astronomer Arthur Eddington wrote in a book published in 1927, saying: “not only is the universe stranger than we imagine, it is stranger than we can imagine.” He was riffing on the words of compatriot scientist J. B. S. Haldane, who wrote, also in 1927: “now, my own suspicion is that the universe is not only queerer than we suppose, but queerer than we can suppose.”
Stranger. Queerer. Take your pick.
These people nailed the nature of the universe one hundred years ago, with a fraction of the knowledge we have today. And what we know now will likely only represent a mere fraction what we’ll know in another one-hundred years. I think it’s a little too soon to say we’ve figured out the universe.
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Too complicated for algorithms: the universe cannot be a simulation
3 November 2025
The bus I’m on arrives at an interchange stop but a minute late and misses the connecting service which left a minute earlier than scheduled. The bean grinder at the cafe breaks down just as I arrive.
The door phone at a friend’s apartment is on the blink, and I’m in a phone black spot and unable to call them. The internet connection drops mid way through a bank transaction, and refuses to reconnect for several minutes, leaving me wondering whether the payment went through or not.
A micro-tear in my water bottle partly soaks the contents of my day bag. A succession of late-evening (no less) traffic delays sees us reach the supermarket a minute after closing time. My laptop crashes as I open the lid to resume a session. This is what happened one day.
They’re all minor irritations, but were pretty much consecutive. Of course it was a run of bad luck, yet occasions like these are enough to make me think the universe is a simulation, I’m a Sim, and am being cruelly manipulated by player of the game that is the universe we live in.
I need no longer think that though. An international team of researchers, lead by Dr Mir Faizal of Canada’s University of British Columbia, have found the universe is, in essence, too complicated an entity to be the product of a computer generated simulation:
Their findings, published in the Journal of Holography Applications in Physics, go beyond simply suggesting that we’re not living in a simulated world like The Matrix. They prove something far more profound: the universe is built on a type of understanding that exists beyond the reach of any algorithm.
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A loophole for surviving the heat-death of the universe, or a noose?
3 October 2025
The people at Kurzgesagt are pretty clued-up. They must learn a lot, about everything really, in their line of work. As a result of this ceaseless learning, they might have found a way, for whatever lifeforms are still present, to evade the eventual heat-death of the universe.
Although still conjecture, this is how the universe might “end”, in trillions of years hence. Long after the last star has stopped shining, long after the last black hole has finally disintegrated.
Under this scenario, the universe won’t, or isn’t expected to, collapse in on itself. Seemingly the cosmos will continue expanding forever, as a dark, cold, void.
This, however, appears to the ideal environment for eternal life. In short, a civilisation Kurzgesagt calls the Noxans, will harvest vast amounts of energy from their galaxy, or what’s left of it. This will be stored in a massive battery bank, which the Noxans will draw off for untold trillions of years.
Untold trillions of years, but not forever. This near eternal life, however, won’t be living as we know it.
The temperature in the universe at this stage will be barely an iota above zero degrees on the Kelvin (K) scale. For reference water freezes at about two-hundred-and-seventy degrees on the Kelvin scale. Zero degrees K, or absolute zero, will be pretty cold. Too cold to even play ice-hockey.
But the Noxans will not be particularly active. Their digital avatars, which is all that will remain of them, will spend their waking hours engaged only in thought.
They will need to slumber to conserve resources. But this off-time will aid in cooling them down further, in turn reducing their power needs, in turn extending the life of their batteries. Didn’t the Noxans do well, surviving trillions upon trillions of years after the universe’s heat-death?
Kurzgesagt calls their method a loophole, but it seems more like a noose to me.
I’m curious as to what sort of material the battery banks, and whatever structure the Noxans will “reside” in, are made of. How will these endure for eternity without repair or replacement?
But sitting around in an ice-box until the battery goes flat doesn’t seem like fun. There has to be a better way for a civilisation to live forever. And maybe there is.
The Noxans, it should be pointed out, are what’s called a Type III civilisation on the Kardashev scale. This means they’re able to harness all the energy within a galaxy.
In comparison, Type I civilisations control all the energy on their planet, Type II their solar system. Humanity might be considered a zero-point-seven civilisation. But when Nikolai Kardashev, a Soviet astronomer, draw up his scale in 1964, he did not venture beyond Type III.
Other people though, including Hungarian academic Zoltan Galántai, speculate the existence of Type IIII, and even V civilisations, may be possible.
A Type IIII civilisation would have all the energy of the universe at its disposal. Type V entities meanwhile could probably create a whole new universe in which to live. This seems like a better plan for the Noxans. If they’ve made it as far up the scale as III, they could push on higher.
Reaching the ultimate top level, in this case V, would be a challenge, as I’m sure any gamer could tell you. But if the Noxans start now, with potentially many, many, trillions of years in front of them, I’m sure they could do it.
Eventually freezing to death in a glorified refrigerator seems like an absurd idea in comparison.
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Time may be an artificial construct, but it feels awfully authentic
3 July 2025
Managing time when time doesn’t exist, from the Multiverse Employee Handbook, a science comedy podcast, produced by Robb Corrigan:
The real productivity crisis emerged when physicists tried merging Einstein’s relativity with quantum mechanics. They discovered something that would terrify any time management consultant: the Wheeler-DeWitt equation — quantum gravity’s fundamental mathematics — contains absolutely no time variable.
So maybe time doesn’t exist in the realm of physics, but who cares about physics when you’re running late for that train you must be on. Or when the hours and minutes are dissolving ahead of a critical deadline. Or anything else for that matter. And if time in fact does not exist, that’s not a problem either, the universe, and us along with it, carry on as usual.
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humour, physics, podcasts, science
UFOs, flying saucers, at Area 51, nothing but a military cover up?
12 June 2025
This sounds like the news that no one wanted you to hear:
The congressionally ordered probe took investigators back to the 1980s, when an Air Force colonel visited a bar near Area 51, a top-secret site in the Nevada desert. He gave the owner photos of what might be flying saucers. The photos went up on the walls, and into the local lore went the idea that the U.S. military was secretly testing recovered alien technology. But the colonel was on a mission — of disinformation. The photos were doctored, the now-retired officer confessed to the Pentagon investigators in 2023. The whole exercise was a ruse to protect what was really going on at Area 51: The Air Force was using the site to develop top-secret stealth fighters, viewed as a critical edge against the Soviet Union.
Hands up those who believe any of that, hey?
Otherwise, if someone could explain how extraterrestrials can travel vast distances through the galaxy to reach Earth, in vessels the size of a bus, apparently capable of travelling at the speed of light (or supposedly faster) without saying “oh, but they can bend the laws of physics”, I’m all ears. No warp powered motherships capable of cloaked flight either, please.
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Milky Way might not collide with Andromeda, Milkomeda might not form
4 June 2025
Some recently revised calculations, based on some more recent data, have shown our galaxy, the Milky Way, may not collide, or if you prefer merge, with Andromeda, a large galaxy presently about two and a half million light years away.
Astronomers have long believed a merger/collision to be inevitable. Although heading towards to each other — at an eye watering speed of about one-hundred kilometres per second — there’s close to a fifty-fifty chance both galaxies will simply sail passed each other.
Milkomeda, the name given to the would-be merged entity, and something I’ve written a bit about in the past, may never come to pass after all. But then again it might, no one can be one-hundred percent sure. Uncertainty is the only certainty.
If you’re stilling gunning for the formation of Milkomeda though, here’s an animation of the what the collision might look like, from the perspective of a far distant observer. Events play out over ten billion years, but are compressed to a minute, meaning things won’t be quite as violent as they look.
Even if Earth were still around at this point — which seems unlikely in five billion years time — the merger/collision of the two galaxies would probably make little difference to anyone still here. Aside from an upheaval in the way the night sky looks, that is.
Despite appearances, galaxies are mainly made up of empty space, meaning the chances of a star from Andromeda barging into the solar system would be pretty remote.
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astronomy, milkomeda, Milky Way, physics, science
Does the universe reside within a black hole?
17 March 2025
Good morning, welcome to the new week, and mind-blown Monday. Today we’re discussing life, the universe, the rotation of galaxies, black holes, and everything.
Data collected by the James Webb Space Telescope (JWST) has concluded about two-thirds of galaxies in the universe rotate in one direction, while the remaining third rotate the opposite way. In a supposedly normal course of events, the balance would be more even. Apparently.
But there is any such thing as normal in the cosmos? You know what they say. Truth is stranger than fiction. The universe is not only stranger than we can imagine, it is stranger than we can imagine. Two-thirds of galaxies might spin in one direction, because, you know, just because.
But there’s no just because in this universe. The imbalance in the rotational direction of the galaxies suggests to some astronomers that the universe was born inside a black hole. Since the black hole hosting our universe rotates in one direction, it follows that the majority of galaxies will spin in the same direction. Nikodem Poplawski, a theoretical physicist at the University of New Haven, describes this as the “simplest explanation” of the phenomenon:
“I think that the simplest explanation of the rotating universe is the universe was born in a rotating black hole. Spacetime torsion provides the most natural mechanism that avoids a singularity in a black hole and instead creates a new, closed universe,” Poplawski continued. “A preferred axis in our universe, inherited by the axis of rotation of its parent black hole, might have influenced the rotation dynamics of galaxies, creating the observed clockwise-counterclockwise asymmetry.”
I wonder how far up and down the “levels” of universes residing inside black holes goes then? If our universe is indeed located within a black hole, it follows that other universes must reside within the plentiful black holes that populate our universe. And inside those universes will be yet more black holes, that will be home to further universes. And so on.
But where does our black hole universe sit in such a hierarchy? Near the top? In the middle somewhere. Or near the bottom? If such a thing exists, as there may be no limit to how how far down the progression can go. The same applies going up the other way of course, in theory.
It’s mind blowing stuff for sure. If, that is, you accept this two-thirds versus one-thirds split of galaxy rotation represents a significant imbalance in the first place. There might still be room for just because here. After all, weird things just happen in this wondrous universe of ours.
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Gravastars and black holes, a weird cosmic double act
2 January 2025
The concept of gravastars (or gravitational vacuum stars) is a fascinating alternative to the idea of black holes, although if their presence were ever proved, they would not rule out the existence of black holes. Proposed by Pawel O. Mazur and Emil Mottola some twenty years ago, these objects are consistent with Albert Einstein’s general theory of relativity.
Gravastars, like black holes, form in the aftermath of some supernova explosions. They are relatively small, their size might be similar to London, capital of the United Kingdom.
In terms of appearance they are black, and a little like balloons, having an extremely thin shell, consisting of matter scientists do not yet understand. Their interior is filled with a vacuum, or dark energy, bustling to break out, but unable to do so. Gravastars sound like an incredible phenomena, but in a universe some think is devoid of dark energy, I wonder if they could actually be present.
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