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Post by skekSil on Dec 8, 2021 18:55:30 GMT
So what is the giant cube on the moon the chinese just found, lets all speculate. I say legos! Perhaps a rubiks cube? A borg ship? Its that one pip Lego block that always gets lost and can only be found by stepping on it at the most inconvenient moment.
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Post by AngryFrozenWater on Dec 25, 2021 16:57:18 GMT
After many delays the James Webb Space Telescope has been launched into space at Christmas. Everything You Need to Know About NASA's James Webb Telescope - Anton Petrov. An astrophysicist’s live reaction to the James Webb Space Telescope Launch - Becky Smethurst. James Webb Space Telescope Launch - NASA.
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Post by Beerfish on Dec 25, 2021 18:46:45 GMT
All the brilliant scientists at these launches are not thinking about the wonders that their new toy will provide or all the great studies they can do. They are all thinking "Please don't blow up, please don't blow up, please don't blow up."
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Post by AngryFrozenWater on Dec 25, 2021 18:55:44 GMT
All the brilliant scientists at these launches are not thinking about the wonders that their new toy will provide or all the great studies they can do. They are all thinking "Please don't blow up, please don't blow up, please don't blow up." Yes! This mission is extremely expensive. Now that it has been launched the next headache is whether it will stay alive for the next ten years to complete its mission, because, unlike Hubble, the Webb cannot be repaired.
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Post by AngryFrozenWater on Dec 26, 2021 17:39:38 GMT
Meanwhile Sabine had her own vision about Christmas... We wish you a nerdy Xmas! - Sabine Hossenfelder.
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Post by Deleted on Dec 26, 2021 23:27:27 GMT
Saw this earlier today, got a laugh.
***
The first test pictures from the James Webb all came back...
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Post by AngryFrozenWater on Dec 27, 2021 22:31:40 GMT
The next video was released a few days before the launch of the James Webb Space Telescope. It gives you more details about what the device is meant to do by interviewing several scientists involved. The JWST will be tested in the next two weeks and will be calibrated for six months. It will be fully operational in the summer of 2022. Things We’ve Never Seen: The James Webb Space Telescope Explores the Cosmos - World Science Festival (presented by Brian Greene). Brian Randolph Greene (born February 9, 1963) is an American theoretical physicist, mathematician, and string theorist. Greene was a physics professor at Cornell University from 1990–1995, and has been a professor at Columbia University since 1996 and chairman of the World Science Festival since co-founding it in 2008.
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Post by B. Hieronymus Da on Dec 28, 2021 0:08:40 GMT
I've been thinking. There're problems with the expanding universe, the red shift, "heat death" and Entropy. While Entropy is a nice model for many things, I wasn't entirely convinced even as young, when I learned about these things. And Big Bang presents a mystery. Since then, mathematical understanding of unpredictable, exactly organized systems doesn't, IMO, ring quite true with the Entropy hypothesis.
To put it simply: If the death by falling Entropy is correct, why do the Universe exist at all? Why the Big Bang? Why the spontaneous flashes of energy and anti-energy in black nothingness? There's something fishy in simple, 'common sense' models.
If there's one Big Bang, why not more? That's even assuming Big Bang is true. But why not more? "Far from here"? Why shouldn't there be far from here? Because space time itself was created in Big Bang? Was it now? What if the red shift is not due to doppler effect?, But is something else that has something to do with the implicit, underlying system that spans up the system that forms space-time and the distances in it?
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Post by AngryFrozenWater on Dec 28, 2021 0:53:16 GMT
I've been thinking. There're problems with the expanding universe, the red shift, "heat death" and Entropy. While Entropy is a nice model for many things, I wasn't entirely convinced even as young, when I learned about these things. And Big Bang presents a mystery. Since then, mathematical understanding of unpredictable, exactly organized systems doesn't, IMO, ring quite true with the Entropy hypothesis. To put it simply: If the death by falling Entropy is correct, why do the Universe exist at all? Why the Big Bang? Why the spontaneous flashes of energy and anti-energy in black nothingness? There's something fishy in simple, 'common sense' models. If there's one Big Bang, why not more? That's even assuming Big Bang is true. But why not more? "Far from here"? Why shouldn't there be far from here? Because space time itself was created in Big Bang? Was it now? What if the red shift is not due to doppler effect?, But is something else that has something to do with the implicit, underlying system that spans up the system that forms space-time and the distances in it? Oh. I love to think about those issues too. The problem is that the more we know, the more questions are raised. About the one Big Bang. I wasn't convinced either. Isn't it intuitive that there may have been something before the Big Bang? And why shouldn't there be another? And perhaps there are more universes. Even parallel ones. If the Big Bang created time and space then how come the Big Bang created those from literally nothing? However, there are no solid theories about any of those questions. At best there are hypothesis. Since none of them can be proven or falsified, believing in any of those is more akin to religion and outside the realm of science. That doesn't mean we shouldn't look for answers, but for now it seems best to concentrate on what we can observe and study. That almost seems like I am too conservative about this, but I am skeptical, until we are closer to truth, wherever it may lead. There are many research papers about these topics, but the thing with research papers is that the majority of those papers will be disproved sometime later. And that is how things ought to be, but it makes it hard what to believe.
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Post by B. Hieronymus Da on Dec 29, 2021 22:31:30 GMT
I learned the lifespan of the James Webb telescope is only 10 years. That is hugely disappointing and seems like a huge waste. Someone has cut pennies and weight at the wrong place (the fuel is the limiting factor).
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Post by AngryFrozenWater on Dec 30, 2021 0:11:46 GMT
I learned the lifespan of the James Webb telescope is only 10 years. That is hugely disappointing and seems like a huge waste. Someone has cut pennies and weight at the wrong place (the fuel is the limiting factor). 5 years seems to be a the worst case scenario. It depends on the number of trajectory corrections. However, one of the scientists in the last video I posted estimated a lifespan of 10 to 20 years. Brian Greene was pleasantly surprised by that.
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Post by Deleted on Dec 30, 2021 8:43:14 GMT
We might also have different options for resupply in a decade.
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Post by AngryFrozenWater on Dec 30, 2021 9:53:18 GMT
We might also have different options for resupply in a decade. One of the other scientists in that video mentioned that she was worried about the serviceability of the JWST, because no missions for that are planned. As far as I know manned missions are hard, because of the distance and we don't have space vehicles for manned missions like that. Another option would be a robotic mission. However, mission planning takes many years. The JWST development began in 1996 and construction was completed in 2016. Then it was tested for 5 years. Of course a telescope is something different than sending a robot into space, but I can't image that they would rush it. So, if we need to resupply the JWST 10 years from now, then we should start development of that robot tomorrow. And like I said, nothing is planned. Another problem is funding. Politics works slow and convincing politicians to spend huge amounts of money isn't easy. Since it is a collaboration between the Americans (NASA), Europeans (ESA) and Canadians (CSA), it may further complicate things. In 1996 they thought the JWST would cost half a billion dollar, but the total amount spent was 9.7 billion. That doesn't make politicians happy.
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Post by B. Hieronymus Da on Dec 30, 2021 17:01:05 GMT
We might also have different options for resupply in a decade. One of the other scientists in that video mentioned that she was worried about the serviceability of the JWST, because no missions for that are planned. As far as I know manned missions are hard, because of the distance and we don't have space vehicles for manned missions like that. Another option would be a robotic mission. However, mission planning takes many years. The JWST development began in 1996 and construction was completed in 2016. Then it was tested for 5 years. Of course a telescope is something different than sending a robot into space, but I can't image that they would rush it. So, if we need to resupply the JWST 10 years from now, then we should start development of that robot tomorrow. And like I said, nothing is planned. Another problem is funding. Politics works slow and convincing politicians to spend huge amounts of money isn't easy. Since it is a collaboration between the Americans (NASA), Europeans (ESA) and Canadians (CSA), it may further complicate things. In 1996 they thought the JWST would cost half a billion dollar, but the total amount spent was 9.7 billion. That doesn't make politicians happy. What would be needed is a bigger, heavier, uprated service module to the CrewDragon. But with that, the Falcon Heavy should be able to launch a manned mission (and back) to L2. I haven't looked at the Van Allen belts though. It might be that it takes more, and longer time, to go outside and rush the radiation in the belts. But they did this when Apollo went to the Moon. Then again, they used the Moon's gravity to brake. But anyway, roughly, there's a way. Such a service module, with increased capabilities and flight time, would take time to develop enough for manned flight, many years, I'd guess.
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Post by AngryFrozenWater on Jan 1, 2022 18:06:07 GMT
Important updates and less known facts about the James Webb Telescope launch - Anton Petrov. More details emerge about the launch, trajectory and fuel. After the optimism in Brian Greene's video, NASA now predicts a lifespan of 10 to 15+ years and the video explains why. It also explains its trajectory in the initial stages, the "wiggling" after that, the aft momentum flap and more.
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Post by B. Hieronymus Da on Jan 2, 2022 23:13:04 GMT
I'm going to explore this myself when I get time.
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Post by B. Hieronymus Da on Jan 8, 2022 19:39:41 GMT
James Webb telescope has unfolded all or almost all of itself now. Sun shield, secondary and primary mirror are deployed.
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Post by q5tyhj on Jan 9, 2022 1:01:47 GMT
I've been thinking. There're problems with the expanding universe, the red shift, "heat death" and Entropy. While Entropy is a nice model for many things, I wasn't entirely convinced even as young, when I learned about these things. And Big Bang presents a mystery. Since then, mathematical understanding of unpredictable, exactly organized systems doesn't, IMO, ring quite true with the Entropy hypothesis. To put it simply: If the death by falling Entropy is correct, why do the Universe exist at all? Why the Big Bang? Why the spontaneous flashes of energy and anti-energy in black nothingness? There's something fishy in simple, 'common sense' models. If there's one Big Bang, why not more? That's even assuming Big Bang is true. But why not more? "Far from here"? Why shouldn't there be far from here? Because space time itself was created in Big Bang? Was it now? What if the red shift is not due to doppler effect?, But is something else that has something to do with the implicit, underlying system that spans up the system that forms space-time and the distances in it? Oh. I love to think about those issues too. The problem is that the more we know, the more questions are raised. About the one Big Bang. I wasn't convinced either. Isn't it intuitive that there may have been something before the Big Bang? And why shouldn't there be another? And perhaps there are more universes. Even parallel ones. If the Big Bang created time and space then how come the Big Bang created those from literally nothing? However, there are no solid theories about any of those questions. At best there are hypothesis. Since none of them can be proven or falsified, believing in any of those is more akin to religion and outside the realm of science. That doesn't mean we shouldn't look for answers, but for now it seems best to concentrate on what we can observe and study. That almost seems like I am too conservative about this, but I am skeptical, until we are closer to truth, wherever it may lead. There are many research papers about these topics, but the thing with research papers is that the majority of those papers will be disproved sometime later. And that is how things ought to be, but it makes it hard what to believe. Its important to separate the popular conception/representation of the BBT from the actual accepted science: its common to hear the BBT referred to as a theory of the "beginning" or "creation/origin" of the universe, when that simply isn't part of the accepted theory. The accepted, observationally well-established part of the theory simply posits a hot, dense early state of the universe some 13.8 billion years ago. But it is a classical theory, it doesn't not include quantum mechanics. But you only get to a "beginning of the universe" if you continue rolling the clock backwards past the point where quantum effects have become significant... In other words, by extending the BBT past its proper domain of application. And I understand the desire to do so; we're curious by nature, and if we have a theory that says "X happened at time Y", its a natural question to say, "well, what happened before Y?" The problem is we don't have any established physical theory to describe the very early universe, because gravity is significant on the quantum scale, and we do not have a theory of quantum gravity (candidate theories like string/M-theory and loop quantum gravity remain untested). So the entire question of what, if anything, preceded the big bang, or whether it was a "beginning" or "creation" of the universe, remains entirely open. Past-finite models remain on the table. Past-eternal models remain on the table. And that's not even getting into some of the weirder and purely speculative proposals like Smolin's cosmological natural selection (the interior of every collapsing black hole leads to a Big Bang in a bubble universe) or Penrose's Conformal Cyclical Cosmology (the future heat death of this universe is indistinguishable from the big bang expansion of a new universe). Of course, this all ties in to the JWST's mission: collecting data on earliest stages of the visible universe in order to help us understand precisely these questions. So, very exciting indeed.
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Post by skekSil on Jan 9, 2022 3:17:35 GMT
But it is a classical theory, it doesn't not include quantum mechanics. But you only get to a "beginning of the universe" if you continue rolling the clock backwards past the point where quantum effects have become significant... I'm no physicist, does this have something to do with Universe at the very early stage being so small, around Planck length, that quantum mechanics would apply to it?
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Post by q5tyhj on Jan 9, 2022 16:51:55 GMT
But it is a classical theory, it doesn't not include quantum mechanics. But you only get to a "beginning of the universe" if you continue rolling the clock backwards past the point where quantum effects have become significant... I'm no physicist, does this have something to do with Universe at the very early stage being so small, around Planck length, that quantum mechanics would apply to it? Yep, as we roll the clock backwards eventually we get to a point where the universe is small/dense enough quantum effects become significant. Or, maybe more accurately, where gravitation becomes significant on the quantum scale. Usually this isn't an issue, because quantum-scale objects do not have anywhere near enough mass/energy content for gravitation to be significant. So the fact that we have no theory of quantum gravity isn't a problem- gravity is usually completely negligible on the scale where quantum effects occur. But in regimes like the very early Big Bang universe (or in the center of a black hole), matter is compressed enough that gravitation is significant on the quantum scale. At which point, our lack of a quantum theory of gravity means we can really only speculate about what would happen. Its also extremely significant that we get a space time singularity- a point of infinite density, pathological curvature, geodesic incompleteness, etc- at the point where we expect general relativity to break down and cease to be a good description of physical reality. This is why most, if not all, cosmologists regard this "initial" or "Big Bang" singularity as an artifact of a broken theory rather than anything physically real: this singularity is a sign of our models breaking down, not a sign of what actually occurred at this point. Which is sort of disappointing, because spacetime singularities are weirdly awesome and awesomely weird in all sorts of ways. But they probably aren't real. And its not insignificant on this point that candidate theories of quantum gravity like string/M-theory and loop quantum gravity remove this singularity. Also worth noting that most cosmologists accept some form of inflationary theory, which posits an inflationary period prior to the current Big Bang picture. So we should be careful about talking or thinking about the Big Bang as any sort of "beginning" or "creation" of the universe.
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Post by skekSil on Jan 9, 2022 22:37:23 GMT
Its also extremely significant that we get a space time singularity- Regarding that, if going backwards in time our Universe shrinks, i.e. its spatial dimensions get smaller shouldn't something similar happen to time? SO, like, time, what, slows down/speeds up?
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Post by q5tyhj on Jan 9, 2022 23:32:30 GMT
Its also extremely significant that we get a space time singularity- Regarding that, if going backwards in time our Universe shrinks, i.e. its spatial dimensions get smaller shouldn't something similar happen to time? SO, like, time, what, slows down/speeds up? Sort of. Not really. Its... complicated. One of the weird and awesome parts of the theory of relativity is that time can run slower or faster, depending on how fast you're moving or whether you're in a gravitational field ("time dilation"): time is relative. And so in one sense, if you were to compare how our clocks tick here during the present cosmological epoch to some hypothetical clock in the very early universe when matter/energy was very dense, you'd find that the clock in the early universe "runs slower". But we can't actually make such a comparison, and during that early Big Bang era, mass/energy was dense everywhere, so there were no observers or reference frames to which you could compare your clock to such that it was "running slower", and since time is relative there wasn't really any meaningful way time was running slower because there wouldn't have been any frame of reference relative to which time was running slower.
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Post by rewindbutton on Jan 10, 2022 16:10:18 GMT
candidate theories like string/M-theory and loop quantum gravity remain untested) we should be careful about talking or thinking about the Big Bang as any sort of "beginning" or "creation" of the universe. Good Lord, someone here speaks my language! you'd find that the clock in the early universe "runs slower". But we can't actually make such a comparison Remove time from the equation and it starts to make sense. Don't get me wrong, I'm not going to take part in this convo. I'm here for relaxation.
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Post by AngryFrozenWater on Jan 16, 2022 2:38:38 GMT
Thank you for your explanations, q5tyhj. Much appreciated. I have the feeling that you, unlike me, actually did a physics study. Here are some videos that cover something that Mass Effect fans may like... The first one is presented by astrophysicist Matt O'Dowd. His videos are more technical than the other two in this post, but they do cover the same subject: Warp drives. I think that he often speculates too much. However, in this video he seems to have a healthy skepticism. The New Warp Drive Possibilities - PBS Space Time. Matt's description of the above video: "That Einstein guy was a real bummer for our hopes of a star-hopping, science-fiction-y future. His whole “nothing travels faster than light” rule seems to ensure that exploration of even the local part of our galaxy will be an excruciating slow. But Einstein also gave us a glimmer of hope. He showed us that space and time can be warped - and so the warp drive was conceived. Just recently, a couple of papers contend that these are not pure science fiction." Only the first 14 minutes of the video above covers the topic. The rest are his answers to questions from previous episodes. The next video is Anton's take on the same topic, but using a different study... NASA/DARPA Scientists Found a Way To Create an Actual Warp Bubble (In Theory) - Anton Petrov. Anton writes: "[...] we will talk about a new study that discusses how we could potentially create an actual (but tiny) warp bubble." Of course Sabine has something to say about the topic too... Are warp drives science now? - Sabine Hossenfelder. Sabine's thoughts: "Today we'll talk about one of my favorite topics, warp drives. I am fascinated by warp drives because they are future technology straight out of science fiction and yet they are not for any obvious reason impossible. After all, Einstein taught us that space can indeed deform and that distances can indeed shrink and that time can indeed dilate. So why not bend and deform space-time to get us faster from one place to another? Well, the devil is in the details. While warp drives have been studied in Einstein's theory of general relativity, they require unphysical stuff: negative energies, repulsive gravity, or things that move faster than light already. In this video, I summarize what new scientific literature has been published on this in the past year, and what progress has been made."
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AngryFrozenWater
N5
Sir Nose D'VoidOfFunk
Games: Mass Effect Trilogy, Dragon Age: Origins, Dragon Age 2, Dragon Age Inquisition, KOTOR, Baldur's Gate, Neverwinter Nights, Jade Empire, Mass Effect Andromeda
Posts: 3,025 Likes: 8,737
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Sir Nose D'VoidOfFunk
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Sept 26, 2021 14:40:11 GMT
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AngryFrozenWater
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angryfrozenwater
Mass Effect Trilogy, Dragon Age: Origins, Dragon Age 2, Dragon Age Inquisition, KOTOR, Baldur's Gate, Neverwinter Nights, Jade Empire, Mass Effect Andromeda
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Post by AngryFrozenWater on Jan 16, 2022 4:22:31 GMT
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