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The new /sci/ wiki
https://4chan-science.fandom.com/wiki//sci/_Wiki

(More resources in replies)
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>>
Reminder: /sci/ is for discussing topics pertaining to science and mathematics, not for helping you with your homework or helping you figure out your career path.

If you want advice regarding college/university or your career path, go to /adv/ - Advice.

If you want help with your homework, go to /wsr/ - Worksafe Requests

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Welcome to NASA edition

Previous: >>16082724
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>>16085428
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>>16085917
>Based very loosely on a story that isn't like the truth but that we very much wish was
>>
>>16085913
stunning twilight launch!

https://twitter.com/maxhaot/status/1769918709957861593/video/1
>>
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>>16085543
>>16085572
>What went wrong?
>>
>>16085827
>Titan as a fuel depot
Anon I want to believe, but until we have Expanse style meme drives and a solar system wide economy, Titan is in no way a viable fuel source

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Previous thread: >>16056951

>what is /sqt/ for?
Questions regarding maths and science. Also homework.
>where do I go for advice?
>>>/sci/scg or >>>/adv/
>where do I go for other questions and requests?
>>>/wsr/ >>>/g/sqt >>>/diy/sqt etc.
>how do I post math symbols (Latex)?
rentry.org/sci-latex-v1
>a plain google search didn't return anything, is there anything else I should try before asking the question here?
scholar.google.com
>where can I search for proofs?
proofwiki.org
>where can I look up if the question has already been asked here?
warosu.org/sci
eientei.xyz/sci
>how do I optimize an image losslessly?
trimage.org
pnggauntlet.com

Comment too long. Click here to view the full text.

you know, buoyancy makes more sense than things magically wanting to go down
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>>16085117
a peeled one
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>>16085593
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>>16085903
Dishonest measurement, the bottom apple is stuck
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>>16085904
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>>16085112
sorry, buoyancy is just water wanting to magically go down more than floaty things do

Posting here as I don't have a lot of advice/ideas on /k/ and other forums. Perhaps you might help me? I'm making a game based on a hypothetical war on the moon anywhere between 2100 to 2250. It will be a FPS with some limited base building but it will feature realistic physics and weapons & equipment for the setting. Think the game Boundary + Red Orchestra 2 (especially for the dynamic campaign map) with also some influence of Tiberium Sun aesthetics

I need help on a plausible conflict (not aiming on 100% realism but at least that it seems plausible) that takes place on the Moon, anything from weapons, equipment, tactics, ships, politics, everything really. I want to do it specifially on the Moon as I feel it's underused in video games and I feel it has unique aesthetics. Here's some brainstorming I did with my limited knowledge:

>conflict must take place somewhere between 2100 to 2250 because in my opinion the future will be AI & machines only + it's more relatable to our technology
>why people are fighting: helium 3 to power fusion reactors and other minerals/metals
>no alien artefact

>option 1: conflict takes place in the early 22nd century between various private/national mining companies and PMCs as it's a sort of gold rush/scramble for africa. A literal wild west
>option 2: conflict takes place early 23rd century as a proxy war between Earth and Mars. It might seem super obvious that Earth will win but I made a scenario where Mars might have a chance if anyone is interested

Tell me how do you think a war on the Moon will look like. I imagine lots of orbital bombardment but if it's not possible, how will it look like on the ground?
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>>16085154
>the Moon isn't a very good source of mineral and metals. Like it's basically all slag
Lunar regolith is an excellent source of both aluminum and oxygen. Not sure where you get the idea that it's "slag"
>>
>>16085632
Depending on where you land, lunar regolith can have roughly as much aluminum(5.6-10.7 wt%) as steel slag(4.5wt%)
https://www.researchgate.net/publication/258661774_Metallic_species_oxygen_and_silicon_in_the_lunar_exosphere_Upper_limits_and_prospects_for_LADEE_measurements
https://www.researchgate.net/publication/283230689_Study_on_replacement_of_coarse_aggregate_by_steel_slag_and_fine_aggregate_by_manufacturing_sand_in_concrete
I wouldn't exactly call it an excellent source of aluminum. I mean you can extract aluminum from just about any rock you find on the ground here on earth, but it's not very economical to do so. Separating out the aluminum from the other crap isn't economical, so we get aluminum from rocks that have relative high concentrations of aluminum. Rocks that have certain mineral/element concentrated are called ores. And you're less likely to find them on the Moon than on the Earth because water tends to play a heavy part in concentrating minerals and the Moon has fuck all.
>>oxygen
there is unironically too much. It basically becomes a waste product if you're processing regolith.
Moon mining's always gonna suck, but hey you gotta work with what you got.
>>
>>16085154
As far as I know, one of the main appeals of fusion is that it does not emmit any kind of radiation. And about concentration of helium 3 and other ressources, well has the whole Moon been thouroughly prospected? Have the Apollo missions sampled hundreds of meters deep? That's where I take some liberty in my plot, helium 3 is in general rare on the Moon except some areas that have way higher concentration, hence the conflict
>>
>>16085858
I think there's some neutron radiation with fusion. but you don't need heavy radioactive elements which can be hazardous
>>
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>>16085858
>>As far as I know, one of the main appeals of fusion is that it does not emmit any kind of radiation
lol no. Even with near magic fusion it emits lots of neutrons. Using He-3 doesn't reduce the neutron radiation hazard from fusion rockets much. Pic related.
>>helium 3 is in general rare on the Moon except some areas that have way higher concentration,
Not geologically possible. Helium-3 can only be on the surface because it's deposited there by solar wind.
>>has the whole Moon been thouroughly prospected?
no, but it's pretty unlikely to have anything worth fighting for. A lot of processes that really concentrate minerals require water, but as far as we know the Moon basically never had much water. Our current understanding of the Moon's formation is that it formed in a big impact event. This blew away a lot of the water and other volatile elements. But yeah, the Moon has most of the same stuff Earth has only easier to launch into space.

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Good news everyone, Arctic ice accumulation is above average for this time of year compared to the average for this century so far. Seems like the global warming doomsday scenarios that so many scientists have been predicting aren't coming true, isn't that great news? I know you're ecstatic to hear it, especially the people who are so concerned about the environment, they should be extra happy to see this good news.
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>>16073486
>Arctic ice accumulation is above average for this time of year
The globalists (jews) will pick another metric, e.g. there will be a temperature record for 1AM on the 3rd of July in the Chicago hood, which disproportionately affects niggers.
>>
>>
>>16083799
Are you kidding? That's what climate change deniers do. Prime example >>16082782
>>
>the amount of ice in the arctic at the coldest part of the year doesn't change much.
No shit dumbass.
Late winter sea ice extent means nothing.
Show summer sea ice extent compared to the 30/40 year average or early winter (October-Dec) sea ice.
>>
>>16085511
>>16085471
Why does seeing good news about the environment make you so angry?

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I don't know much about space or engineering

is this shit realistic and will it actually happen in the medium future like 50/100 years?
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>>16082363
4rpm is barf city
>>
>>16085437
L1 looks comfy
>>
>>16082839
that's unironically like Hawaii. people go there, fail, become homeless and can't get back to the mainland.
>>
>>16084215
This assumes we run out of material to build these colonies. The Asteroid Belt is yuuge.
There could be many colonies each one sparsely populated.
Now, where you may have a point, is if one of these colonies is full of misfits (or Mormons) and decides to cut itself off from the others. Like, by becoming a generation-ship and launching itself at Wolf 359 or Trappist-1 or some nearby dim bulb like that.
>>
>>16085510
You slowly spin it up until people complain. A lot of people could tolerate even 6rpm if it took a week to spin up to that rate.

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Why did the scientific revolution happen in Europe instead of other parts of the world, like the African continent?
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>>16069837
>nigeria 84 iq
what makes them so much smarter than the rest of africa?
>>
>>16084426
Probably the Igbo and maybe the Yoruba.
>>
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>>16084426
Nairaland has excellent memes
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>>16045030
>So Arabic science in the 11th cent faded away because of this?
I don't agree with that anon but a big reason the Muslim world censored the use of the printing press (with notable exceptions given to Jewish communities) is because early printing presses didn't print the Arabo-Persian script that well. That and Big Calligraphy(tm) lobbied against it since calligraphers were big time artisans in the Muslim world.
>>
>>16069837
Clearly shows higher IQ doesn't necessarily equal a better society, since Botswana is lower than the DRC and supposedly on a similar level to Somalia (although some part of Somalia are less chaotic than others).

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North American grey squirrels have taken over England and wiped out the native red squirrel population. This demonstrates that the two populations can't live side by side and that if greys are permitted to encroach the reds will eventually be eliminated.
The greys now have a toehold in mainland Europe and are rapidly expanding their territory at the expense of the reds.
Should grey squirrels be holocausted in Europe in order to preserve the native red squirrel population?
Should the greys be exterminated in England in order to return the reds to their natural and rightful homeland?
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>>
The squirrel movement is a effect of the simulation, you should let nature take it's course. Story goes, when the greys infect the reds, all pain will end.
>>
>>16082393
They hitched a ride on friendly albatrosses
>>
>>16056407
>grey squirrels are better adapted to Europe
that's BS, grey squirrels carry a virus that kills red squirrels, hence why they're taking over
>>
>>16084635
fake news
>>
>>16056981
>In Norway I see a squirrel maybe once every other year
Squirrels know Norway is a barren icehole.

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where are all the aliens???
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>>16084866
there's no safe zones, it's all poisoned by radiation?
>>
>>16083984
https://youtube.com/shorts/8MnHHLU1lSI?si=gs9dxUIN3a_uRHmz
>"aliens are the conspiracy for stupid people" - Tim Dillon
>>
idk
>>
>>16084179
Chilling, relaxing
>>
Interstellar travel isn't economically feasible. That's why we won't colonize other star systems and neither will the the ayys. Most space development is private sector now and focused on exploiting the resources of the solar system. These companies won't go to other star systems unless there is huge money potential.

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With the new ai robot shit coming out, how long do you all think it will be before we get android or even cloned people? I need a monika in my life asap PLAP PLAP
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>>16083375
Bump
>>
>>16083375
Why would a robot need to be sentient for you to fuck it?
>>
>>16083375
https://en.wikipedia.org/wiki/Optimus_(robot)

10 years? Elon will probably realize optimus sells better if it's soft. It's also less dangerous if it falls on you
>>
>>16084383
I would prefer clones so i can impregnste her
>>
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>>16084520
I don't want my robot waifu to be soft.

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The arithmetic progression of the form 3n+1 contains at least one prime.
Assume it doesn't, then for any natural a, b, (3a+2)(3b+2)=3c+1 so that there is a bijection between naturals c and (a, b).

But notice that (3a+2)(3b+2)=((3a+1)+1)((3b+1+1))=((3x+2)(3y+2)+1)((3z+2)(3w+2)+1)

Notice something weird?
You guessed it if you look at mod 3, the remainder (number not factored by x or y or z or w) tends to a very big number the more such "nesting" is performed on the form (3n+2).

Brilliant! In fact this proof works for every prime p and 0 < q <p for the progression pn+q.

I won't tell you the details of course because I don't want to spoil anything (hint: just decompose a progression into corresponding multiples of progressions(
>>
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Implicitly, [math]\alpha(n)=3n+1[/math] is and endomorphism on the natural numbers and so is [math]\phi(a, b)=(3a+2)(3b+2)[/math] so that the composition [math]\alpha^{-1}\circ\phi[/math] is a bijection.
Then there's nesting [math]\phi=(\phi+1)(\phi+1)[/math]
And finally there's a contradiction since there is a very big margin in the image of [math]\alpha^{-1}\circ\phi[/math] once nesting is applied.
Hence there is at least one prime number.

Tadaa..
>>
>>16085829
Uhhh I meant a surjection
>>
>Numbers that are +1 or -1 an even number have a chance of being prime.
Holy shit

Are there any intellectually stimulating videogames? Do any of you play videogames?

I've cut myself off entirely to focus on school and reading as videogames represent a slippery slope toward a hedonistic and self sabotaging lifestyle for me, but I feel the itch again. I figure maybe if I can at least convince myself what I'm playing is beneficial to some sort of neural processes and also limit my time, perhaps I can enjoy something I've enjoyed so much but in moderation.

>t. ex player of world of warcraft for 12-16 hrs a day
I can't let myself go back to that shit man. Its basically a lifestyle of being plugged into a dopamine-drip simulator. Its barely even a fucking game
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Any fellow Factorio chads here?
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>>16084711
>Baldurs Gate 3
>Starfield
>>16084735
>>
video games are for children, if you're playing them as an adult its because you have arrested psychological development. before the term "retarded" became stigmatized, "arrested psychological development" was referred to as "retarded psychological development".
https://en.wikipedia.org/wiki/Arrested_development
>the UK's Mental Health Act 1983 used the term "arrested development" to characterize a form of mental disorder comprising severe mental impairment, resulting in a lack of intelligence
>>
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>>16085246
LMAO
>>
>>16084265
KSP is a lot of fun and you learn orbital mechanics along the way.

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Sup Math Nerds
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>>16085729
Sup. Ever heard of the number 4? I've used it a few times.
>>
>>16085729
>>>/x/
>>
>>16085732
>>16085744
4 is nice
>>
>>16085732
4 is a chump.
"What is 2 plus 2?", that's chump talk.
7, bitches. 7 is a fucking number.

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Tortured phrases edition.

Last Thread: >>>16021329

This thread exists to ask questions regarding careers associated to STEM.
>Discussion on academia-based career progression
>Discussion on penetrating industry from academia
>Or anything in relation to STEM employment or development within STEM academia!

Resources for protecting yourself from academic marxists:
>https://www.thefire.org/ (US)
>https://www.jccf.ca/ (Canada)

Information resource:
>https://sciencecareergeneral.neocities.org/
>*The Chad author is seeking additional input to diversify the content into containing all STEM fields. Said author regularly views these /scg/ threads.

No anons have answered your question? Perhaps try posting it here:
>https://academia.stackexchange.com/


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>>16064725
You should know the job market is terrible. Can't get a job out of ug? You can waste more time getting a masters just to finally get that 80k job.
>>
>>16084315
Graduate with the CS degree asap, math undergrad is notoriously useless. Shitty resume will prevent you from entering big tech but you can make a decent living being a code monkey somewhere small.
>>
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How do I break the procrastination cycle?
>get assignment
>worry about making the perfect assignment because expectations are always vague
>brainstorm
>feel tired from worrying and planning
>daydream for a couple days
>no sleep because worrying
>realize I have ~four hours before it's due
>everything snaps into place
>receive a 90%
This isn't good for my health and relationships. I'm in my Master's now, and I don't understand it. How do I achieve the t. minus 4 hours mindset before my work is due?
>>16071346
Congratulations, anon! That's great!
>>
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Has anyone successfully networked with strangers and landed a job?

I heard stories from only 1 graduate that got an interview because the hiring manager happens to like him. It has never worked in my experience despite showing up to these events well groomed and properly dressed.

Tips and tricks is appreciated.
>>
>>16067045
not him but I work in MEP as an EE. you need to be able to get your PE eventually, so ABET or nothing.


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