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Re:I’m a Physicist Who Searches for Aliens. U.F.O.s Don’t Im... by SideburnsOfDoom on Tuesday June 01, 2021 @09:24AM (#27354021)
IMHO, the strong argument against this being real is how it is "perpetually liminal", i.e. just on the threshold of verification, but staying there. It never quite crosses over into solid evidence. The signal never improves. Even over decades, it never proceeds from a sighting to an artefact in a museum. The results never change from "promising" to "promise fulfilled".
Re:I’m a Physicist Who Searches for Aliens. U.F.O.s Don’t Im... by wpietri on Tuesday June 01, 2021 @10:01AM (#27354620)
For sure. One of humanity's greatest changes in recent decades is the rise of cheap video recording. Security cameras are everywhere. 3 billion people have smartphones. I could go to YouTube and spend all day watch rare, improbable events that have been caught on camera.

But during that time a number of liminal phenomena have stayed liminal. Bigfoot. Ghosts. UFOs. Angel and demons. Clairvoyance. Haunted houses. Telepathy. Dowsing. Many more, I'm sure.

There are two ways to explain that. One is that all of those things have gotten way better at avoiding evidenced encounters. The other is that they are like the scary animals/monsters kids imagine lurk just outside the firelight when you take them camping: things humans imagine to fill the gaps when sensory data is ambiguous.

Re:I’m a Physicist Who Searches for Aliens. U.F.O.s Don’t Im... by ssully on Tuesday June 01, 2021 @10:57AM (#27355324)
Well for UFOs (I.E. something that is flying that is hard to identifying, not exactly ALIENS!), I think it's two things.

1. Phone and security cameras are good for objects in close distance. The farther the object, the worse the quality. Best example I have is that I live close to a flight path of a local airport. I've tried to take photos (with an iPhone 11) of interesting airplanes to send to my friends who work in aviation, but the pictures are usually crap. I don't have an exact metric, but I would say its something like every 1 or 2 pictures out of 10 is good enough to identify the plane.

2. There actually are a lot of modern UFO videos on Youtube and the rest of the web that you can spend hours watching. It's just that they are mostly taken with phone cameras, so your video categories will basically be: "that's clearly someone practicing their CGI skills", "that looks like trash/that's clearly a drone", "That's neat and I can't really explain it". I dug through a few popular subreddits and youtube channels last month as we saw an influx of UFO stories in the media and this was basically my experience. It's a fun way to kill some time, but yeah you aren't going to get the high quality videos you want.

Re:I’m a Physicist Who Searches for Aliens. U.F.O.s Don’t Im... by wpietri on Tuesday June 01, 2021 @11:19AM (#27355766)
What you're ignoring is that now we have orders of magnitude more data (e.g., the YouTube video you mention) but still no more signal. Just like it was in 1970s, the strongest we've got is still "that's neat and I can't explain it".

This is like "God of the gaps" theology: https://en.wikipedia.org/wiki/God_of_the_gaps

The claimed phenomenon keeps retreating to exactly fit into the gaps of our ignorance. And it will always keep retreating, because filling in the unknown with quasi-anthropomorphic entities is what humans have been doing since long before they invented Zeus and Thor.

Is it possible it's all UFOs or angels or Huginn and Muninn running errands for Odin? Sure. But there is no more reason to favor one explanation over the other. And the world is full of infinite things we don't have enough data to explain.

Why is that particular bird outside your window right now? Why is it singing the song it does? One explanation is that space aliens are using it to spy on you; the birdsong is how it communicates to coordinate observations with other birds. Maybe the iPhone 11 just isn't good enough to show the construction flaws in the feather patterns that would prove it too is a UFO.

But that theory is exactly as valid as "the explanation for this video is UFOs" and we should treat them with equal weight.

Re:I’m a Physicist Who Searches for Aliens. U.F.O.s Don’t Im... by ssully on Tuesday June 01, 2021 @12:20PM (#27356945)
I will just start by saying that I think UFO stuff is interesting, but I am not convinced it's aliens. Just fun to read up on every few years.

With that said, I don't know how we will get beyond "that's neat and I can't explain". My belief is these UFO's are man made or natural phenomena. In order to fully explain them all, it requires us to know what is man made (disclosure from governments), and then study and understand the natural phenomena.

If this was actually aliens, then I don't think we will get past the "this is neat and I can't explain" unless they want us to. The way I reason with it is that it is the equivalent of if we time traveled a fighter jet or submarine to the 14th century. People back then would have no way to reason or prove what they were seeing unless we landed those vehicles and demonstrated to them. Even then, they would probably think the machine were a creation of pure evil or something.

Re:I’m a Physicist Who Searches for Aliens. U.F.O.s Don’t Im... by wpietri on Tuesday June 01, 2021 @12:48PM (#27357481)
We will never get beyond "that's neat and I can't explain" because there will always be liminal events.

Your "it could be aliens" argument applies exactly as well to fairies, angels, demons, demi-gods, wizards, Satan, time travelers, humans from other dimensions, etc. If you weight one of them more highly than the others, you should examine why. But the answer won't be in the evidence.

Re:I’m a Physicist Who Searches for Aliens. U.F.O.s Don’t Im... by gadf on Tuesday June 01, 2021 @10:45PM (#27364197)
What you're ignoring is that "signal" is in the interpretation. You're blind to that. You can crank up data, and wind down your "signal" to confirm your existing biases. In fact that's what you need to do to preserve your "no unexplained" belief system. And that's what you see, people reaching for every more crazy explanations to pretend they didn't see what they saw: "the pilots hallucinated, and the battlegroup sensors all hallucinated, at the same time, repeatedly, over a few months"

I like the liminal theory but this isn't the same thing.

Re:I’m a Physicist Who Searches for Aliens. U.F.O.s Don’t Im... by wpietri on Wednesday June 02, 2021 @12:12AM (#27364753)
Nah. As I mentioned, I believe alien life is very likely to exist somewhere in the universe. I'd be fucking thrilled if it were to drop by for a visit. Fairies and wizards and dragons and whatnot would be cool too. But that doesn't prevent me from seeing that all of these have been on the margins for a long time, and continue to be on the margins despite the massive increase in our ability to document things over the last couple centuries.
Re:I’m a Physicist Who Searches for Aliens. U.F.O.s Don’t Im... by gadf on Wednesday June 02, 2021 @12:50AM (#27364960)
That part of you wants to believe in alien visitors, seems to be independent of the priors you have (about the impossibility of this) that filters your interpretation of the data. I think that's normal. People's ideas do not need to be self-consistent and can "contain multitudes".

To extend the pirate rapists example from my other answer. Maybe you'd never known a pirate that had raped a person, but I think if you knew someone who told you that story, and you'd heard other people had similar experiences, you'd certainly believe them.

Or maybe not pirates but Trump supporters. Or whatever group fit your priors for likely/payoff for you to do this. So the "aliens are not a smart possibility" here is just an interpretation skewed by the way you want to read signal in the evidence.

It's equal that we can look at the same things and come to different conclusions. That's diversity of opinion and experience. But maybe you haven't even looked at the same things. Certainly we look at them in different ways.

I believe aliens are here. But I'm not saying this Navy evidence points to that definitely. I'm saying it doesn't rule it out. It's smart to keep open to it. I'd say the preponderance of witness evidence over decades without a doubt points to that they are here. Does this evidence prove it? No to me. But I know it. It's what I believe based on my own knowledge and experiences.

You have a different belief is normal. I don't think either of us can claim to be "right" on this topic re evidence (tho about the solar system, what do you think about those weird obelisks? structures on the moon? NASA's history of censoring space photos? Lights on Ceres, on Phobos, on Luna?)

In one view, the lack of solid widely accepted data is why there's so much "meat" to be argued about, but actually I don't think that's the meat, that's just reaching the ground consensus that people will reach different conclusions and I think as long as they do so with an open mind to the evidence that's valid.

I do think you have to admit that what you say about it comes not from evidence, but from your interpretation of it. It's not proven either way, it's just your belief that it's so. And that's all that matters so far right.

Re:I’m a Physicist Who Searches for Aliens. U.F.O.s Don’t Im... by JulianMorrison on Tuesday June 01, 2021 @11:07AM (#27355511)
Also cellphone cameras didn't generally do well in low light. "Fuzzy unfocused blob of light" is a whole genre of UFO videos.

This may be becoming less of an issue with the newest generation of cameras.

Re:I’m a Physicist Who Searches for Aliens. U.F.O.s Don’t Im... by wpietri on Tuesday June 01, 2021 @11:23AM (#27355837)
It will not become less of an issue, because better cameras just push the liminal bubble out farther. There will always be something far enough away to be ambiguous, and that will be the new proof of UFOs. That is how it has gone for decades of improvement in recording technology.
Re:I’m a Physicist Who Searches for Aliens. U.F.O.s Don’t Im... by suifbwish on Tuesday June 01, 2021 @10:11AM (#27354767)
There is a BIG difference between Bigfoot which would be limited to the forested areas of the earth and UFOs which would have the entire universe to inhabit and hide in. With our most advanced cutting edge telescopes and other remote sensing tech we have trouble detecting planets and other not glowing large bodies of mass if they aren’t orbiting a star, how on earth does anyone think we can confidently say there are no space craft present that we cannot see? Sounds more like everyone wants to believe that rather than it being based on any type of observation.
Re:I’m a Physicist Who Searches for Aliens. U.F.O.s Don’t Im... by wpietri on Tuesday June 01, 2021 @10:21AM (#27354904)
Sure. The same logic is true of angels. How can we confidently say that supernatural beings aren't everywhere around us right now? How can you say I'm not a demon here to trick you into denying God's glorious helpers?

The answer to this is that there are infinite possible things that could be true. But until there's decent evidence, nobody is obliged to take it seriously.

Do I think there is alien life somewhere in the universe? The odds seem very good. Do I think that a bunch of them have crossed the galaxies just to spend decades hanging around and fucking with people? I don't in the slightest. The simpler explanation is that primate brains evolved to survive on the African savannas are maybe not perfectly tuned to dealing with a universe 93 billion light-years across. That all of these ever-liminal phenomena share a pretty mundane set of explanations in the evolutionary history of the human cognitive architecture.

Re:I’m a Physicist Who Searches for Aliens. U.F.O.s Don’t Im... by gadf on Tuesday June 01, 2021 @10:51PM (#27364240)
What if they are already in our solar system, hidden, or holed up on some moon somewhere, and they have been for eons. They don't have to come across the galaxies to get here (even if they can, even if that's where they're from). If they're already in our local area you don't need to pretend aliens are physically impossible to arrive. And that possibility seems equal with all others in this speculation, but people rarely consider it, and instead sight the (shortsighted) "physical impossibility" of travel from far away regions in milky way or outside, as "explanation" for why anything we see cannot be aliens. But it's lazy and stupid and doesn't consider this local cluster possibility.

No one's ever "obliged" to do anything, particularly about this, but "decent" is your judgment. What the decent evidence your family loves you? It's not hard data. it's a story you piece together and your existence depends on it. Far less high stakes whether or not aliens are visiting us or not, for you personally, for easier to accept or reject this belief for personal reasons.

I think something else is involved in what makes this hard for people to consider. Not sure what it is. Maybe something like ridiculous anthropocentrist arrogance? "Aliens can't travel here because we don't know how they could."

Re:I’m a Physicist Who Searches for Aliens. U.F.O.s Don’t Im... by wpietri on Wednesday June 02, 2021 @12:25AM (#27364830)
Anything's possible, but I deny aliens being resident in the solar system is equally possible.

What you're doing is classic "god of the gaps" thinking. Science fiction from 100 years ago imagined aliens on Venus and Mars. From early telescope images, people believed there were canals on Mars. It was all bunk, of course. We have enough data that current live on Mars and Venus looks much less likely. So now you've pushed the little green men back to the parts we can't see as well. That's not because there's any evidence there, but because you have started with a conclusion and you're reasoning toward it.

Re:I’m a Physicist Who Searches for Aliens. U.F.O.s Don’t Im... by gadf on Wednesday June 02, 2021 @01:19AM (#27365126)
And what you're doing is denying looking at stuff because it doesn't confirm your biases. There's a bunch of weird things in solar system and mountains of evidence for weirdness on Earth that you'd have question marks over if you were being honest about this.

You may say you want there to be aliens here but you're not acting like you're willing to engage with the evidence about this. You're viewing it through a preconceived idea.

Right there's no smoke gun evidence for solar residence but there's no evidence for them not being there. Circumstantial evidence for proximity to help explain the evidence that they're here on Earth.

"God of the gaps" is a biased and weird way to describe something you do every day. You have a hypothesis, you know there's something wrong, somewhere, but you don't know where it is. So you go looking. Is it in your fridge? No. The closet? No. Under the rug? Backseat of the car? No. Where could it be? Maybe you just imagined the thing. But you were so sure. But there's no evidence....But there is. You sensed something was wrong. You saw the thing yesterday, and now can't see it.

Because you have some Wikipedia page and fancy scary name for some thing that's a normal part of human thinking (and science -- where are all those particles? Let's search in other energy levels and collisions ...) then any thing that looks like that is "little green men" and "bunk"? Come on. By that logic the housemate's lost package, the smell in the living room and the bug you hunt down in your program is bunk.

You're sure there's a bug (might it not just be how you're measuring it?), and you employ a process of elimination. That you employ that process does not make you crazy...but it seems you would look yourself in the mirror and think, "I'm crazy for doing god in the gaps thinking about this bug." Or is that just what you say about others but not yourself?

I just think it's not the type of erroneous thinking you think. It's actually logical. We have a big search space, we have some signals, now go find where they originate. It's a big space, and you don't have access to any of it. If you want to sit there and say, there's nothing there. That's completely illogical. It's not even "unlikely" that there's nothing there. You have signals on Earth, and by your logic of the impossibility of intergalactic travel, the signals are more likely to originate locally.

So... just because you didn't find it on Venus or Mars (so far, but have you been there?), doesn't mean they're not here. There's a lot of places we haven't looked, and they could be there.

You may deny it but that doesn't change one iota of the reality. It's just your belief about it. "God of the gaps" cuts both ways. Every time you see a gap, "You can say, see this is more support to what I'm saying." I can say that. SO can you. It doesn't disprove what you think is unlikely. It doesn't make it more likely. People used to say Marilyn Monroe made a man more of what he was. Cocky men became more cocky in her presence. Timid men more timid. Maybe the gaps show us what we really think, not what's really there? It doesn't show you anything. It's not "god of the gaps" it's unknown in the gaps.

Only thing it shows is we're both willing to fill in the gaps with certainty. You're certain they're not in the solar system. Another idea that supports the notion that aliens visiting Earth is more likely than without them being in the solar system? You deny it. To support your pre-existing belief? Of course not. Simple because the evidence guides you toward that in your unbiased appraisal of it. Come on... You're blind to the interpretive nature of your conclusions, and still hide that in the perception that the "sensible majority consensus" aligns with your view. But that very conservatism makes you an unreliable speaker about these mysteries. What value can you add if you're not willing to engage with the gaps?

"Ah, it's a big black unknown. Leave it alone. Nothing to see there."

You're saying it's all bunk, is the bunk. Because you don't know. Have you searched every crevice of the solar system to prove there's no life there? That someone had a story that was a wrong interpretation of the data, but if true supports a 'they're here' hypothesis, does not disprove that hypothesis if their interpretation is wrong.

I'd say we don't have nearly enough data to rule it out. 'Much less likely' compared to a strawman? Still can be very likely.

You've kept the little green men out of your garden because it doesn't make sense to you that they're here. Or you felt in the past it's just too much fun for you to argue with those that believe. And you think the time is still here when denying evidence of this stuff still looks rational. But that time has passed. It now looks crazy to say the evidence leads you to stretch denials into invoking a certainty of impossibility in the face of ambiguity and lots of signal.

Re:I’m a Physicist Who Searches for Aliens. U.F.O.s Don’t Im... by suifbwish on Wednesday June 02, 2021 @07:50PM (#27375434)
You are making up a magical unicorn extreme example. Yes technically you cannot use deductive reasoning to prove there are no angels or gods or supernatural entities we cannot see. For our purposes an extraterrestrial intergalactic species that could reach our planet would be exactly what you just described. We cannot prove these entities are not out there. Just remember science and reason do not allow us say anything with certainty that cannot be calculated or measured, it’s just as much a fallacious religion to claim they don’t exist as they do, one real risk is what happens if either side is correct. If you are correct and aliens do not exist, it doesn’t matter at all however if you are wrong and they do, there are entire classes of possible dystopian and utopian realities that become actual possibilities. Moderate Preparation and risk minimization is really all anyone can do to address the unknown.
Re:I’m a Physicist Who Searches for Aliens. U.F.O.s Don’t Im... by ceejayoz on Tuesday June 01, 2021 @10:21AM (#27354908)
> There is a BIG difference between Bigfoot which would be limited to the forested areas of the earth and UFOs which would have the entire universe to inhabit and hide in.

No. Bigfoot, as with UFOs, could exist on other planets. That's not the assertion being made with these recent videos, though. Just like Bigfoot, they're alleged to be here, on Earth.

Re:I’m a Physicist Who Searches for Aliens. U.F.O.s Don’t Im... by risk000 on Thursday June 03, 2021 @01:09PM (#27384272)
The liminal nature of the phenomenon is the calling card of a higher intelligence, seeking to fulfill/manifest it's understanding of metaphysical principles.

The primary metaphysical principle which, in my understanding, is seeking to be respected by these intelligences is this: Free will, even on the level of deciding what is allowed to be considered as real. A UFO that "proves its existence" to you has made concrete decisions about how it wants to alter your worldview. I believe that is a no-no.

The evidence that you will find in favor of UFOs, matches precisely or semi-precisely what the deeper nature of your belief system and mind want to believe about them. The Twining Memo alone, if meditated on and considered for its implications, proves beyond a doubt the reality of the phenomenon. I could rattle off a list of a half-dozen books that go into the topic in great detail. The amount of deathbed confessions and former insider testimony will astonish anyone, truly. The freedom to disbelieve in these things is protected. But even the Pentagon just came out saying that "UAPs" harass them regularly (with the implication known to those of us who research the matter, that this has happened ongoingly now for 70 years).

Basically just choose to open yourself to the possibility and I think you will find the evidence.

Re:I’m a Physicist Who Searches for Aliens. U.F.O.s Don’t Im... by tgflynn on Tuesday June 01, 2021 @09:42AM (#27354330)
What if that's exactly the effect that the source of the phenomenon is trying to achieve ?
Re:I’m a Physicist Who Searches for Aliens. U.F.O.s Don’t Im... by JulianMorrison on Tuesday June 01, 2021 @09:45AM (#27354376)
When you tease a kitten with a laser pointer, the beam dot is moving in ways kitten-brain-physics can't comprehend and has to read as a lifeform. Why would you you so confuse a poor critter?

The answer "it's very funny" should not be ruled out.

Re:I’m a Physicist Who Searches for Aliens. U.F.O.s Don’t Im... by c22 on Tuesday June 01, 2021 @01:24PM (#27358115)
I'm not convinced the cat is confused into thinking it's a life form, though there is perhaps some confusion due to the non-material nature of the dot. My cat knows that I control the laser and complains to me if I turn it off too soon.
Re:I’m a Physicist Who Searches for Aliens. U.F.O.s Don’t Im... by deergomoo on Tuesday June 01, 2021 @09:53AM (#27354485)
> the beam dot is moving in ways kitten-brain-physics can't comprehend and has to read as a lifeform

It is a lifeform—a lifeform with a laser pointer teasing a cat.

Re:I’m a Physicist Who Searches for Aliens. U.F.O.s Don’t Im... by wpietri on Tuesday June 01, 2021 @10:05AM (#27354682)
My dad would joke about making a Q&A book called "The Fundamentalist's Guide to Science". On each left page would be a good question, like, "Why is the sky blue?" or "Why are there stars at night?" On each right page you'd see, "Because God wants it that way."

Ultimately, an "explanation" that can explain any set of data is useless. I will grant, given the state of the world, "Because God is fucking with us," is an emotionally satisfying one. But ultimately it's just as unhelpful as "Because God wants it that way" from a scientific perspective.

Re:I’m a Physicist Who Searches for Aliens. U.F.O.s Don’t Im... by tgflynn on Tuesday June 01, 2021 @12:34PM (#27357197)
The truth doesn't care whether you like it or not or whether you find it "helpful". We can't really ever exclude the possibility that we're merely playthings for beings far more advanced than ourselves. Usually we don't need to assume that such things exist to explain our observations but if we do encounter observations that don't fit our models of reality we do need to consider other possibilities.
Re:I’m a Physicist Who Searches for Aliens. U.F.O.s Don’t Im... by wpietri on Tuesday June 01, 2021 @12:43PM (#27357399)
What "truth" means is exactly the question here, so you can't use it as an answer like that.

There's a world full of natural phenomena which we perceive dimly. We try to create linguistic structures that explain it. A proposed change to that linguistic structure, like "Fairies are real," can only be more or less helpful in explaining the world we observe.

As George Box said, "All models are wrong; some models are useful." We should always be open to possibility. I am equally open to Bigfoot, UFOs, ESP, vampires, fairies, Santa, and Thor as explanations for phenomena. Which is to say that they are historically bad explanations that can never be disproven, but which have been demonstrably unhelpful in explaining the world.

Re:I’m a Physicist Who Searches for Aliens. U.F.O.s Don’t Im... by gadf on Tuesday June 01, 2021 @10:57PM (#27364277)
You can disprove all those things. You just have to find "the real thing" that gives rise to the evidence people talk about, and say, "see it's not X, it's Y". X disproved. But it's a bit dishonest to lump all together. UFOs we have thousands of witnesses, and radar data. Santa we don't have as many witnesses or data.

If we find some Bigfoot like civilization living underground, but that's different to how we think of Bigfoot, we've "explained" Bigfoot and disproven "the wrong version" of Bigfoot.

If Thor lands on Earth and say, "I'm back," but says, "btw my name is "Bor". We've disproved "Thor". If we discover people with some disease which makes them live indoors, drink lymph fluid and live for hundreds of years, we've disproved "vampires" but explained the stories around that.

At the level of speculation we're operating at, these things can be argued both ways. It's not truth that brings you down on one side or another, it's your preference. You're blind to that.

Re:I’m a Physicist Who Searches for Aliens. U.F.O.s Don’t Im... by wpietri on Wednesday June 02, 2021 @12:10AM (#27364738)
You can't disprove those things. People who believe in ghosts or fairies or angels or gods always beliefs plus claims of evidence. You can disprove some part of the evidence, but they'll always have another bit of evidence where there's not enough data to prove anything one way or the other.

It's the same deal with space aliens visiting Earth. The evidentiary basis for that is no stronger than that for aliens. You're correct that it's preference that leads some to favor aliens over angels, etc. But that's all it is.

Re:I’m a Physicist Who Searches for Aliens. U.F.O.s Don’t Im... by gadf on Wednesday June 02, 2021 @12:43AM (#27364925)
so they'll believe them. You can disprove/prove it but you just won't convince them: the certainters on either side. The situation you describe is different to proof, it's more subjective, more to do with resistance.

It's an exact mirror of the practice you see of people who don't want to believe in aliens visiting Earth, inventing new ways to avoid the evidence, whether it's sensor data, witnesses whatever.

"The evidentiary basis for that (fairies and ghosts) is no stronger than that for aliens."

That's an objective sounding statement, but it's just your interpretation and preference. By what standard? If we had hundreds of thousands of people around the world saying they'd been raped / kidnapped by a gang of roaming miscreants dressed up as pirates, and these people had missing time, missing clothes, and then we had the EU maritime agency come out and say, "We've captured what seem to be swarms of pirate ships on radar". Would you still not believe them?

Re:I’m a Physicist Who Searches for Aliens. U.F.O.s Don’t Im... by jwally on Tuesday June 01, 2021 @11:41AM (#27356222)
I forget the math behind it; and could be totally wrong but I think for every additional caveat you add to a hypothesis to make it fit the data post hoc, it cuts the odds of your new hypothesis in half.
Re:I’m a Physicist Who Searches for Aliens. U.F.O.s Don’t Im... by im3w1l on Tuesday June 01, 2021 @11:54AM (#27356478)
No, not quite. It depends on your prior assumptions. Basically imagine that you have these preconceptions

  Possibility                      Prior probability 
  No aliens                        0.55
  Aliens at the perceptual limit   0.1
  Completely invisible aliens      0.2
  Obviously visible aliens         0.15
Now the math is simple. You cross out the impossible: obviously visible aliens. Then you need to get the remaining options to sum to 1 again. This is done by dividing by the total.

  Possibility                      Posterior probability 
  No aliens                        0.55 / 0.85
  Aliens at the perceptual limit   0.1 / 0.85
  Completely invisible aliens      0.2 / 0.85
  Obviously visible aliens         0
Now you may wonder where the prior probabilities come from. Well they are simply your best guesses based on reasoning and thinking, before having looked at the data. For instance they may be informed by your knowledge of physics and how easy it is to make things invisible. And they may be informed by extrapolating human psychology onto aliens (see the other response about a human playing with a cat using a laser pointer). You may consider the precedent of bacteria existing all around us for a very long time without detection.
Re:I’m a Physicist Who Searches for Aliens. U.F.O.s Don’t Im... by jwally on Tuesday June 01, 2021 @12:37PM (#27357258)
To be honest, I'm stealing from here: https://www.richardcarrier.info/archives/11868 (The cost of making excuses)

Which if I understand; would go like this on explaining UFOs:

Naive Approach:

P(ALIENS) = 50% p(~ALIENS) = 50%

Time elapses and I find some new evidence that looks like this:

P(Evidence | ALIENS) = 30% P(Evidence | ~ALIENS) = 90%

Which gives my hypothesis (Its Aliens) a posterior probability of 25% => (50% X 30%)/(50% X 30% + 50% X 90%).

I want it to be aliens so I say that they're conducting studies on us which juices P(Evidence | ALIENS && Studying Us) = 100%. But because I have no evidence to back that up, the odds are no better than 50/50; and I have to drop the prior of my new hypothesis (UFOs are Aliens who Study us) to 25% (50% X 50%). This nets out a new posterior probability of around 27%.

P(ALIENS AND They Study Us) = 25% p(~ALIENS) = 75%

P(Evidence | ALIENS & They Study Us) = 100% P(Evidence | ~ALIENS) = 90%

I'm new to Bayesian logic and am still shaky with it, so there could totally be glaring errors I'm overlooking, but as I understand it that's what I was trying to get across - Every new caveat you add to explain away a poor data fit shouldn't juice your odds.

Re:I’m a Physicist Who Searches for Aliens. U.F.O.s Don’t Im... by im3w1l on Tuesday June 01, 2021 @02:08PM (#27358792)
If anyone wonders why our approaches look so different, it's because I assumed ideal evidence that cleanly disproved one hypothesis without affecting any of the others. I did choose the list of hypotheses to ensure that was (approximately) valid.
Re:I’m a Physicist Who Searches for Aliens. U.F.O.s Don’t Im... by SideburnsOfDoom on Tuesday June 01, 2021 @09:44AM (#27354350)
Why would they? What if you're overthinking it?
Re:I’m a Physicist Who Searches for Aliens. U.F.O.s Don’t Im... by tgflynn on Tuesday June 01, 2021 @09:54AM (#27354515)
Why do human scientists force mice to find their way through strange mazes ?
Re:I’m a Physicist Who Searches for Aliens. U.F.O.s Don’t Im... by SideburnsOfDoom on Tuesday June 01, 2021 @09:57AM (#27354557)
You've basically re-invented capricious elves and pixies.

It's an exercise in medievalist superstition dressed up in a cheap sci-fi veneer. Waste of time.

Re:I’m a Physicist Who Searches for Aliens. U.F.O.s Don’t Im... by JulianMorrison on Tuesday June 01, 2021 @10:08AM (#27354716)
Wait until you dig into the lore on capricious elves and pixies and realise that it overlaps UFO lore in the kinds of weirdness it contains, despite being recorded by people separated by centuries, continents, and cultures.
Re:I’m a Physicist Who Searches for Aliens. U.F.O.s Don’t Im... by gadf on Tuesday June 01, 2021 @11:00PM (#27364296)
Exactly. "The Phenomena" is sort of all encompassing. I think that's an interesting thread that's come out recently. Jeremy Corbell advances the idea (not the first to, tho) that things like ghosts, consciousness, the multiverse and ETs are all connected.

In some sense it's easily dismissed as "trivially lumping together all things we don't understand" and calling it "quantum". But on another level there does seem to be overlap: in types of experiences, places they happen, and other things I don't know about.

Re:I’m a Physicist Who Searches for Aliens. U.F.O.s Don’t Im... by arcanon on Tuesday June 01, 2021 @11:08AM (#27355522)
When I built mazes for gene knockout mice, we did it for addiction/pain research. The mazes themselves are really cool. You get to program all these little doors and sequences. Come for the research, stay for the fun.
Re:I’m a Physicist Who Searches for Aliens. U.F.O.s Don’t Im... by jwally on Tuesday June 01, 2021 @11:01AM (#27355394)
It’s Peppermint-Patty(?) from the Peanuts cartoon pulling the football away from Charlie Brown just before he kicks it.

Fool me once, shame on you; ok I know the last 892 times we told you it was different but it turned out not to be different - BUT THIS TIME ITS REAL...

Re:I’m a Physicist Who Searches for Aliens. U.F.O.s Don’t Im... by chaoticmass on Tuesday June 01, 2021 @12:09PM (#27356757)
You're thinking of Lucy.
Re:I’m a Physicist Who Searches for Aliens. U.F.O.s Don’t Im... by onion2k on Tuesday June 01, 2021 @09:52AM (#27354471)
the strong argument against this being real is how it is "perpetually liminal", i.e. just on the threshold of verification, but staying there. It never quite crosses over into solid evidence

Aliens could be actively trying not to be detected. It would be quite reasonable if they're monitoring us for them to disturb us as little as possible and not to leave any evidence behind. That's how humans study nature after all.

Re:I’m a Physicist Who Searches for Aliens. U.F.O.s Don’t Im... by JulianMorrison on Tuesday June 01, 2021 @11:13AM (#27355623)
If you're trying not to be detected at all, you don't do about nine tenths of the stuff UFOs do, like flying around with lights on, stopping right over the head of some ordinary person on the road and dropping a searchlight on them, or buzzing military jets and ships.

If you're trying to fuck with the humans though...

Re:I’m a Physicist Who Searches for Aliens. U.F.O.s Don’t Im... by SideburnsOfDoom on Tuesday June 01, 2021 @10:00AM (#27354608)
> Aliens could be actively trying not to be detected.

You're not the first to suggest that, but it just doesn't pass a smell test. I mean, why and how? And with such consistently liminal results? Always on that edge.

It's an exceedingly "extraordinary claim".

They _could_ but it's pretty ridiculous.

Re:I’m a Physicist Who Searches for Aliens. U.F.O.s Don’t Im... by onion2k on Tuesday June 01, 2021 @10:57AM (#27355320)
I mean, why and how?

Why is simple. If they're monitoring us they probably wouldn't want to affect the result of their observations. That's exactly why people studying nature on Earth try not to have an impact on what they're observing. It affects the outcome and it results in bad science. Or maybe they're shy.

As for how ... we're talking about hypothetical aliens who have crossed galaxies to watch us. Speculating about how they might hide from us when they get here in an HN post is beyond futile. How the heck would anyone know?

Re:I’m a Physicist Who Searches for Aliens. U.F.O.s Don’t Im... by SideburnsOfDoom on Tuesday June 01, 2021 @11:00AM (#27355384)
Yes, I get the drift. It's certainly a self-contained consistent belief you have there.

Utterly absurd, though.

Re:I’m a Physicist Who Searches for Aliens. U.F.O.s Don’t Im... by zionic on Tuesday June 01, 2021 @10:27AM (#27355006)
That's actually a rather weak argument, as it ignores the phenomenon's own intelligence. This would work if it was natural/"dumb".
Re:I’m a Physicist Who Searches for Aliens. U.F.O.s Don’t Im... by SideburnsOfDoom on Tuesday June 01, 2021 @10:43AM (#27355169)
The argument only fails if the phenomenon is both motivated to do this, and capable of doing it without fail for decades.

i.e. it not only has to not be natural/dumb, it has to choose this pointless course of action, and execute it without failure.

It's a very extra-ordinary claim that that point. With only perpetually liminal proof. We can't rule it out, but https://news.ycombinator.com/item?id=27354904

Re:I’m a Physicist Who Searches for Aliens. U.F.O.s Don’t Im... by JulianMorrison on Tuesday June 01, 2021 @09:38AM (#27354255)
At least some of that is humans.

Those videos got leaked, and then tentatively confirmed, but is the military releasing all the other gubbins they have, like radar tracks and voice transcripts? Are they heck.

Re:I’m a Physicist Who Searches for Aliens. U.F.O.s Don’t Im... by sandworm101 on Tuesday June 01, 2021 @11:44AM (#27356287)
>> The signal never improves.

It does. The xkcd comic below says it best. In recent decades the number of available sensors (cameras) have radically increased. So too has the quality of those cameras. But have we seen more and better pictures? No. The quality of evidence is not tied to the increasing quality of the signal source. If anything, the signal is increasingly pointing towards 'not real'.

https://xkcd.com/1235/

Re:I’m a Physicist Who Searches for Aliens. U.F.O.s Don’t Im... by SideburnsOfDoom on Tuesday June 01, 2021 @03:34PM (#27360076)
What I meant by "the signal" was the opposite.

But it's also true that something that remains liminal while sensors radically improve, is actually retreating fast. And that is a signal.