/sci/ - Science & Math

>>11419068
So basically a Fermi Paradox thread?

>>11419073
basically yes. but with the added biosignature meaning they probably know about us.

cant see shit

>>11419068
It's entirely possible bio signatures are incredibly common in the universe and obviously even the JWST can only detect those so far out

>that means if a civilization was at our tech level for around 3 billion years now it could spot that earth has life on it
sure, if they happen to exists close enough

>>11419085
hmm. if bio signatures were common then it would be that single celled organisms changing biospheres is common then. so then even if a race has the ability to see life all they detect is shitty primordial planets.

>>11419092
hmm. do you know what the range of detection for the JWST is? i wonder what the max range we can detect is. might give us an idea about where we should focus our search for aliens.

jwst will never launch, it doesn't exist. its just an embezzlement scheme.

>>11419102
hope your wrong, i've been waiting for literal years for that thing to fucking launch. just LAUNCH IT. i want to see alien atmospheres.

>>11419101
>us
>we
i already have a really good idea about the potential capabilities of a 6.5m mirror at various wavelengths because i've spent enough time studying optics to learn the basics.

>>11419068
Any advanced civilization could constantly be sending transmissions to every single star in the entire galaxy without an unreasonable amount of effort. Transmissions we would be able to pick up on and determine artificial origin. Our solar system is off in a dumb corner of the galaxy so we're unlikely to be visited by anyone since the biggest likelihood of life is in the galactic center where there's a bunch more shit closer together. Sending messages is easy, though.

>>11419110
i havent. which is why i asked.

>>11419104
its 16 years behind schedule and 9000% over budget, it could only fail that spectacularly if the failure was well planned out before hand by professionals.

>>11419117
whats it like to want?

>>11419115
im starting to think that we're either the first or in a literal backwater. i mean, not even a probe in 3 billion years of earth showing life? just send a probe to every planet that has a biosign and just make it transmit constantly. the fact that that hasent happened tells me we're again either the first or hillbillies.

>>11419101
>Although the oxygen signal is strong, cosmic distances are vast and M dwarfs are dim, so these stars will have to be relatively nearby for Webb to detect the signal in exoplanet atmospheres within a reasonable amount of time. An exoplanet with a modern Earth-like atmosphere will have to be orbiting an M dwarf that is within approximately 16 light-years of Earth. For a desiccated exoplanet with an oxygen atmosphere 22 times the pressure of Earth’s, the signal could be detected up to about 82 light-years away.

>>11419129
thanks. very very interesting. so lets assume alien tech super good gets that up to 60lightyears to detect an alien atmospheres biosign. that means that aliens can only see there backyard. and radio and stuff is just a meme and dosent work at all, again thanks for being so useful seti. so basically we can only find or be found be our neighbours. but considering that the sun moves around the galaxy, whats the likelyhood that at one point it moved near a civilization, or maybe it just so happened that by the time humans evolved we moved into a shit area with literally no life but ourselves.

>>11419126
self replicating probes would only take a few million years to travel and permanently inhabit every single star in the galaxy. It's very possible that there is some kind of probe currently orbiting our star—it would make sense that you don't want the probe to be obvious. Any day now we could hook in to the galactic internet, finding a probe or the signals or discovering some other form of long-range communication that doesn't degrade. I hope I live to see it, or I hope humanity survives to create it.

>>11419068
There’s aliens right here right now. They fly around in tic tac shaped UFOs

>>11419115
>Any advanced civilization could constantly be sending transmissions to every single star in the entire galaxy without an unreasonable amount of effort

We don’t, but we did pick one up in the 70’s.

>>11419126
>i mean, not even a probe in 3 billion years of earth showing life?

UFOs exist

>>11419155
one thing happening one time is just noise.

>>11419160
iv never seen proof for that. id like it to be true.

>>11419068
>james webb telescope can see
It can't see shit. It is still on the ground. It won't have that kind of resolving power. In fact, nothing can have that type of resolving power for planets outside the solar system. Physics doesn't work that way.

>>11419149
same. but why not make it obvious. whats the point of hiding a probe? wouldent you want a potential civ to see it?

>>11419143
>whats the likelyhood that at one point it moved near a civilization
to answer this question you need to know how many "alien civilizations" out there

>>11419165
https://www.airspacemag.com/daily-planet/ultimate-space-telescope-would-use-sun-lens-180962499/
>Not only is the idea viable, according to the Alkalai team, it would produce images that separate the distant star from its exoplanet, a critical observation that is the goal of future space telescopes equipped with Starshades. And using the Sun as a lens would result in much greater magnification. Instead of a single pixel or two, astronomers would get images of 1,000 x 1,000 pixels from exoplanets 30 parsecs, or about 100 light years, away. That translates to a resolution of about 10 kilometers on the planet’s surface, better than what the Hubble Space Telescope can see on Mars, which would allow us to make out continents and other surface features.

>>11419163
Nope. One thing happening one time is one thing happening one time. A continuous narrowband radio transmission at the hydrogen line is simply aliens, like it or not.

>>11419164
You must live under a rock.
https://www.history.com/news/navy-confirms-ufo-videos-real

>>11419168
dark forest or something, I don't know. It's also possible it's screaming at us and we have interpreted the signals as galactic noise.

>>11419169
and considering we only have one sample thats impossible. you cant even make an educated guess with one sample. well i guess the best you could do is see how many stars when by the sun in the bast 3 billion years in an 100 lightyear radius. and using that at least you would have a number for the amount of possible start you have to deal with.

>>11419180
>well i guess the best you could do is see how many stars when by the sun in the bast 3 billion years in an 100 lightyear radius. and using that at least you would have a number for the amount of possible start you have to deal with.
it's just would just be a meaningless number, unless you know somehow the rate at which those civilization appears

>>11419068
They could see our dinosaurs. You're assuming everyone goes through the same evolutionary pattern tho and receives info the same way.

>>11419190
one less
>just

>>11419190
true, but if you eventually have an average life number you can use that to see how many life potential systems passed us by.

>>11419194
wouldent dinos be worth checking out though? i mean its multi cellular life and it may eventually have an intelligent civ on it.

>>11419194
being able to harness oxygen is crucial for complex life as we know it—only small, dumb single-celled organisms are anaerobic. If in the billion years they were evolving, not a single multicellular organism developed until cyanobacteria turned the atmsophere into oxygen, we can conclude that there are at least serious barriers to complex life without an oxygen atmosphere.

>>11419200
sure, eventually

>>11419204
wonder if theres another gas as good or better than oxygen. i honestly doubt it.

>>11419160
>UFO=alien spacecraft
It's alphabet boi black ops.

>>11419228
>Da gubmint has aircraft that can accelerate at hundreds of g and go to space

Whatever helps you sleep at night

>>11419288
there are other phenomena besides aliens or government—it's not a dichotomy.

>>11419171
>according to the Alkalai team
Trust us, goys!