See title. This is a shower thought that popped into me while slowly waking up. I'm thinking, what if due to e.g. gravitational shenanigans, the pull on a planet is such that a planet stands relatively motionless in a fixed position towards its star?

Is that possible or am I forgetting some astronomy basics?

I just don't get it.

According to the theory of special relativity, nothing can ever move faster than light speed.
But due to the expansion of the universe, sufficiently distant stars move away from us faster than the speed of light.
And the explanation is...that this universal speed limit doesn't apply to things that are really far away?
Please make it make sense!

Like lets say I have a kid. And wait till he's 10 or something and sit him down and explain drug use or alcoholism, and pretty much tell him he's screwed due to a lineage of addicts?

This is what I'm visualizing:
A liquid ocean pressed against the inner side of Europa's ice crust, during high tide. Then the tide shifts and the water rushes away, leaving a gigantic hollow shell high above the ocean's surface, like a vast dome stretching towards the horizon in all directions, in total darkness.

Meanwhile, the tidal bulge has rushed halfway across the hemisphere, the water is now pressing against the ice crust there.

If the Jovian system's tidal forces can stretch and knead Io's mantle like silly putty, its' rocky surface rising and falling as much as 100 meters (about 300 feet) each tidal cycle... I can't even imagine how violently the water may slosh under Europa's ice crust.

One final note: considering that Europa is tidally locked with Jupiter, and it is Ganymede and Callisto that can pull in other directions, how long are the tidal cycles there? The principle is like on Earth, but there are extra gears in the mechanism, so to speak, different high and low tides may vary widely between each other.

cross-posted from: https://sh.itjust.works/post/52943342

Hey everyone!

I’m forming a team for a citizen science project called IASC — International Astronomical Search Collaboration and I’m looking for teammates! Interested?

It's nothing too crazy and the process can be underwhelming. I'll say that just so you don't expect anything extraordinary.

Basically, what we'd have to do is analyse images that will be sent to us from these two observatories in Hawaii called Pan-STARRS 1 and 2. And we'd have to look for moving possibily unidentified objects and send an report to IASC (the organization behind it).

It's super quick and simple, and it really shouldn't take more than 20 minutes per pack out of your day and you'll have an entire month to sort through the packs. So, time really isn't an issue and you can do things on your own time.

This is a great way to be part of hands-on science. You're helping scientists track objects and identify new ones. This is very relevant, especially on a planetary defense level. You can't protect yourself from a threat you don't see coming.

They offer certificates to all participants, and the certificates are pretty neat.

Requirements/preferences:

• Willing to commit some time to analyzing telescope images
• Preferably located in the Americas, Europe, or Africa (similar time zones are a plus)

Relevant links: https://science.nasa.gov/citizen-science/international-astronomical-search-collaboration/ http://iasc.cosmosearch.org/

If you want in or have questions, lmk below :)

(Sorry if this isn't allowed mods. I couldn't find anything that said I couldn't do this in the rules T-T)

All animals in their nature exploit the resources they have access to in order to survive/multiply.

Humans however seem to have a trend of exploiting things to the max, even to our own detriment when we completely obliterate the land we're using. Despite having the knowledge to thrive without destroying the planet, we still do it.

Is this human nature at this point, or something else? Interested to see what the science community thinks about how we go to this weird place in our species' evolution

I’ve been consuming a lot of space weather related content for the past couple of years. I understand some of it, but I don’t have a science degree or anything. I understand that there are always risks of CME’s, and that the Sun is in solar maximum, the earths magnetic field is weakening, and there appears to be some connection between coronal holes/sunspots, low density solar winds, and geophysical activity on Earth…but I just discovered this guy, Ben Davidson of Space Weather News, and he’s really blowing my mind. Intuitively and based on some of the recent solar activity, it seems to make sense. Does anyone have a good resource that fact checks his claims?

“The Sun Will Micronova”:

https://youtu.be/-NcrBues58g

His appearance on the Matt Beall Limitless podcast:

https://youtu.be/z8asS7yLpHk

I've read in an Article that meat production causes a lot of co² emission. Now I was wondering if we stopped eating meat completely, would that be sufficient to get under the threshhold of emissions what the planet can process? What is that threshold? Where are we now? How much does meat add to this?

23 Male, microcytic.

On 11/11/2025 I had blood tests done prescribed by my family doctor because I was experiencing problems with lack of strength/general asthenia. The tests showed that I have a serious vitamin D deficiency; specifically, my levels are at 10 ng/mL. The tests also showed slightly elevated levels of albumin (69%) and Folic Acid (31.1 ng/mL), but according to my doctor, these are not cause for alarm.

I want to point out that in the spring of this year, for the first time in my life, I set myself the goal of walking 10,000 steps a day, and I did so every day before lunch (between 12:30 and 1:30 p.m.). In fact, during this period, I exposed myself to the sun for about 40 minutes every day, and I have never felt so good in my entire life. I was able to study without any problems, and I also trained four times a week for two and a half hours. I started having these occasional weakness issues during the summer, when I must admit that I didn't expose myself to the sun much because I suffer a lot from the heat (I live in Italy). So I really think my problem is related to low vitamin D levels, and I would like to feel like I did during that period again.

Since I didn't feel comfortable with this doctor, I stopped seeing him and a doctor friend of mine recommended me to take 8000 I.U. of vitamin D daily.

I started to take the vitamin D approximately 5 days after the tests, let's say I started the 11/16/2025.

The first two weeks I took some simple vitamin D (two 4000 IU tablets) and then, for another two weeks, I started taking a Vitamin D3 + K2 supplement purchased from Prozis, as my doctor friend had advised me to also take vitamin K2 to help transport calcium to the bones. Each capsule of this supplement contains 100 μg of vitamin K and 2000 IU of vitamin D3, so I took 4 capsules.

About two weeks after 11/16/2025, when I started the supplement, I began to feel more intense muscle pain than usual during my gym workouts and a more pronounced sense of fatigue all day along. So I decided, on my own, to reduce my Vitamin D3 supplementation. Recently, I have continued to take Vitamin D3 + K2 supplements, but the dose varies from 1 to 2 capsules (2000-4000 IU).

Essentially, what I noticed was that:

• If I take 8000 IU a day, after 2-3 days the muscle pain and fatigue return at the gym
• If I take 2000 IU per day for a week, I feel pretty good (although not like in the spring), but if I forget to take the supplement one day, after 2-3 days I experience episodes of severe muscle weakness, which prevent me from studying or doing other daily activities.

This month I changed my family doctor and explained this situation to her. She prescribed me a 50,000 IU vitamin D supplement to take once every two weeks. But I'm afraid that taking such a large dose all at once will cause the same problems I have when I take an 8,000 IU dose, if not worse.

So I would like to know, in your opinion, what is the daily dose of vitamin D I should take, and whether muscle pain and general fatigue can actually be linked to vitamin D3 or vitamin K2 supplementation, or to an increase in calcium in the muscles.

P.S. My calcium levels in blood are 9.9 mg/dL.

See title. With the rise to 455 ppm of CO2 (and likely higher for a while), I wonder what the lowest Earth's had, was.

If I'm not mistaken, the highest was during the Permian-Triassic mass extinction, in where the Siberian Traps may have been responsible for making burrowing -- and hence adaptations for stale air -- necessary?

I am not a boy because my parents observed my penis at the 12 week echo. I am a boy because the sperm cell that made me, carried the right chromosome. It was decided at fertilization. Even if my parents never observed me, I would still be a boy.

The experiment described in the Veritasium video splits a particle in an electron and a proton. They must have opposite spin and that is measured at the time of observation. Than there's a whole discussion about faster than light communication, but if the spin is given at the moment of creation, both will have the opposite spin from the start. It can still be random and measurements will still have a 25% failure rate.

What am I missing? Can the spin change between creation and measurement?

What happens if a particle doesn't get observed, does it not have spin?

I make 9kg of bread every weekend (reasons). so when I wake up I start blooming the yeast: 3268gr of water, 109g of sugar, and about 20gr of yeast. I had to leave for something so I came back two hours later, it smelled amazing, next step is to mix in the salt (218gr) and flour (5440gr) , I usually put the flour first then salt. but this time I put the salt first.

What happened? it fizzled like a soda, like mixing baking soda and vinegar, so many bubbles appeared immediately. I noticed because of the sound it made (was looking at the scale numbers).

Obviously it cannot be a chemical reaction because salt does not really react with anything there, at most it kills some yeast cells before mixing because some parts would have high salt content. there has to be some cool biology involved. And I refuse to ask any AI for that

cross-posted from: https://lemdro.id/post/33438194

The way I understand it is the farther away a object is the faster it is moving away from us, but also the farther away something is the older it is. So could that mean things were moving apart faster in the past but are slowing down?

In music there is the very well established practice of placing compressors on audio signals that have too much jarring dynamics from quiet to loud and tend to hurt our ears and not feel aesthetically pleasant. However in the realm of human sight while there is flux and other screen blue light eliminators/eye comfort filters and a decent amount of dark mode support for a lot of software and webpages/browsers... it seems strange to me that I have never found a eye comfort plugin for a computer or phone that attempts to massage abrupt extremes as well as abrupt discontinuous changes in a wholistic measure of a display's light intensity output.

What I am describing would look like is when you opened a new tab from a relatively grey/dark mode dominated display picture in your web browser and the webpage that loaded was all white that instead of being a massive abrupt blast of white to your eyes the "light intensity compressor" would limit how fast the overall brightness of the picture could change and slow the speed down to a pleasant gradual change that ended up presenting the actual very bright display image only after working your eyes up to it. The light intensity compressor could also be a limiter and simply not passthrough overall brightness values over a certain amplitude.

Note I am not asking for "apply dark mode" everywhere tools I am asking if any tools exist that can sit at the end of the image display pipeline and moderate dynamics so that sudden brightness changes were simply not displayed.

I realize this isn't really a directly a science question but since it involves somewhat complicated signal analysis and manipulation concepts I figured science was a better place for it.

If none of these tools exist is there a hard reason they couldn't?

When I search “human nesting behavior” all I get is stuff about expectant mothers. I’m thinking of nightly nest building.

Physicalism or materialism. The idea that everything there is arises from physical matter. If true would mean there is no God or Free Will, no immortal soul either.

Seems to be what most of academia bases their world view on and the frame work in which most Science is done.

Often challenged by Dualism and Idealism but only by a loud fringe minority.

I've heard pan-psychicism is proving quite the challenge, but I hear that from people who believe crystals can cure autism

I hear that "Oh actually the science is moving away from materialism" as well, but that seems to be more crystal talk as well.

So lemme ask science instead of google.

Any reason to doubt physicalism? Is there anything in science that says "Huh well that seems to not have any basis in the physical at all and yet it exists"

Edit: I have heard of the Essentia Foundation and Bernado Kastrup but since it's endorsed by Deepak Chopra I'm not sure I can trust it