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Posted by fuidani 4/17/2025

“Most promising signs yet” of alien life on a planet beyond our Solar System(www.skyatnightmagazine.com)
417 points | 351 commentspage 4
ZiiS 4/17/2025|
Astronomers have yet again found possible signs of alien life.
sgt 4/17/2025|
You're not thinking like a journalist. This is a breakthrough! Alien life has been found! SETI is making contact as we speak.
saaaaaam 4/17/2025||
To be fair, there’s a big difference between journalists and headline writers!

Headline writing is the art of taking something that a journalist has thought about in detail and carefully crafted and making it into something that someone with low to zero interest in the topic might want to read.

Having done both, I got annoyed when headlines misrepresented what I’d written, and journalists got annoyed when I took their perfectly crafted but pedestrian articles and gave them punchy headlines in a desperate attempt to get people to read them...

sgt 4/17/2025||
Fair enough! Also, to the credit of headline writers, I have sometimes clicked on a clickbait article and learned something. If it hadn't been clickbait, I might have missed it.
saaaaaam 4/18/2025||
You've made all headline writers a little happier by saying that!
curtisszmania 4/17/2025||
[dead]
throwaway290 4/17/2025||
TL;DR

- K2-18b

- detected dimethyl sulfide and dimethyl disulfide, false positive possibility is now very low

- "produced by marine-dwelling organisms on Earth", possibility they were produced by other processes (unrelated to life as we know it) not high but maybe unknown unknowns

- other factors like distance from the star are in favor of life & water

- previous studies detected methane and carbon dioxide

energy123 4/17/2025||
> false positive possibility is now very low

It's not that low, unfortunately. From the article:

> They say their observations have reached the ‘three-sigma’ level of statistical significance. This means there's a 0.3% probability the detection occurred by chance. And to reach the accepted level that would mean scientific discovery, observations would have to meet the five-sigma threshold. In other words, there would need to be below a 0.00006% probability they occurred by chance.

fullstackchris 4/17/2025||
Thats what I'd like to know, is this the kind of process that we can _get_ to 6 sigma by more observation time? Or would we need other observations / thats "as good as it gets" for the Webb's capabilities?
sph 4/17/2025|||
> false positive possibility is very low

No, it means we will soon discover how these compounds form naturally. Would love to be wrong, of course.

throwaway290 4/17/2025|||
I meant (and I think the article meant) false positive of gas detection not life
actionfromafar 4/17/2025||||
Maybe the are cooking a lot of paper over there. https://en.wikipedia.org/wiki/Kraft_process
nottorp 4/17/2025|||
If plankton farts them, it's natural too, right?
guax 4/17/2025|||
> The observations also provided a tentative hint of dimethyl sulfide (DMS), a possible biosignature gas, but the inference was of low statistical significance.

From the source paper. It is a very important result but not definitive, false positive is still possible as well as us finding a new way in which DMS can form without a biological process.

Still freaking exciting and fantastic scientific achievement. JWST is already bearing incredible fruits.

psychoslave 4/17/2025|||
Is dimethil something expected to be generated with really procaryote life forms, or only from those with more complexe structures?
dvh 4/17/2025||
Parent is a flare star
throwaway290 4/17/2025||
Like the sun, I guess
milesrout 4/17/2025||
Is there a source for this that isn't plastered with banner ads? I can't read more than a sentence at a time without having to scroll past adverts.

I do wonder why I was stupid enough to pay for a phone with a bigger screen as it just seems to mean more and bigger ads on screen at once and the same amount of content.

mkl 4/17/2025|
Why are you not using an ad blocker? Ads are optional - I didn't see a single one.
what-the-grump 4/17/2025||
[flagged]
abenga 4/17/2025||
You are dismissing a lot of science off-hand by trivializing it snidely. Exactly which part do you think is wrong?
bedane 4/17/2025||
a fart/sewer odor is indeed a sign of life
emorning3 4/17/2025||
Oh please, it's a detection of dimethyl sulfide on a planet far far away whose natural chemistry we don't understand.

Morons, I'm surrounded by morons.

andreygrehov 4/17/2025||
Let’s assume there is alien life on many planets beyond our solar system. Now what? What’s the practical benefit?
kstrauser 4/17/2025||
Suppose it were somehow possible to prove that alien life exists. Like, we get a radio signal saying "hey, Earth! We see you looking at us!" that's conclusive and undeniable.

That would upend a lot of religious teachings which say we're unique and that the world was given to us, as the unique creations of a creator, to consume for our own benefit.

It seems like there could be many practical benefits to showing that's not true. Hey, maybe the concept of infinite exponential growth is a bad idea. Maybe we shouldn't burn the skies and boil the seas. Maybe we should be nice to other intelligent animals, at the very least.

foxglacier 4/17/2025|||
Let's assume I wake up tomorrow still alive. Then what? You're basically asking what's the meaning of life.
andreygrehov 4/17/2025||
If you wake up tomorrow still alive, you can visit HN and downvote my comments. That will impact my karma value. Not a big deal, but still. If there is alien life, you can’t do anything about it. Zero impact.
martopix 4/17/2025||
What's the practical benefit of Beethoven?
andreygrehov 4/17/2025||
Beethoven’s music directly impacts human lives. It evokes emotion and inspires creativity. Its value lies in its immediate effect. In contrast, knowing that life exists millions of light-years away offers no such tangible impact. It’s a data point. An interesting one, sure, but it doesn’t feed the hungry, cure disease, change policy, or even affect your commute. So yea, Beethoven is a lived experience, whereas aliens in Andromeda are an abstract concept.
martopix 4/24/2025||
No, for me knowing certain mind-blowing scientific facts is, personally, as cool as listening to Beethoven.
GistNoesis 4/17/2025||
124 light years seems quite close, it seems to be some sort phytoplankton for now, what can we send there quickly to eradicate them before they become a problem. How much mass of galactic "roundup" should we send ? Do we have the technology yet for planet-scale sanitizing ? Can we pulse some high energy particles at roughly the speed of light and aim it at them ? Do we know if they have some magnetic field protection like earth does ?