Recent comments in /f/explainlikeimfive

DiamondIceNS t1_iuk3yyl wrote

It'd probably be more intuitive to call it "stellar spray".

"Wind" implies that there's already a medium hanging around, and "wind" is just what we call it when it starts to move around. That's not really what's going on. There is no medium quite like that in space (I mean, technically there is, but the absolutely miniscule amounts of it is not what stellar winds are made of).

What stars (like the sun) are doing is basically sneezing particles outward in all directions at all times. Like when you see a person sneeze in just the right light and you see the spray of droplets fly out into the air. There is a kind of flow to it, like wind currents, but it's not a flow of stuff that was already there, it's a cascade of stuff being ejected out from a source.

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johnnyjfrank t1_iuk2p28 wrote

I agree it was the right thing to do to expose the leaks, I just don’t buy that he didn’t want to go to Russia or China in the first place. Also at this point he’s basically helping the kremlin, tweeting all day about how evil the US is while not saying a peep about what’s going on over there.

Obviously he’s probably not free to say what he thinks, but still I don’t buy his story that he just HAD to go to Russia and nowhere else. A lot of places don’t have extradition to the US and aren’t autocratic mafia states with no civil rights

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explainlikeimfive-ModTeam t1_iuk2f7a wrote

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explainlikeimfive-ModTeam t1_iuk1v37 wrote

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listens_to_galaxies t1_iuk1gjr wrote

Space is not a perfect vacuum, in terms of having no matter present whatsoever. It's a strong vacuum, in that is has much much lower pressure than on Earth (where we have a lot of very dense atmosphere causing that pressure).

Different areas of space have some amount of matter, with different amounts and kinds of matter in different kinds of environments. Stars, like our Sun, generally have winds of plasma that is, in a vague sense, boiling off of the star and flying off into space (at hundreds of kilometers per second!). Interstellar space (areas between stars) also has matter throughout: a combination of gas, plasma, and dust, but all very thin. This interstellar medium (ISM) is actually my research specialty as an astronomer. The typical density of the matter in the ISM is something like 1 particle (an atom, molecule, ion, or free-floating electron) per cubic centimeter. For comparison, Earth's atmosphere is roughly 10^(19) (10 billion billion) particles per cubic centimeter. So the ISM is 10 billion billion times less dense than the air we're used to!

All this ISM stuff is moving around. It's orbiting around the galaxy (just like all the stars), and it's mixing around because of turbulence and other effects. And even though it's all so thin, there's still a lot of variation between different locations: there's hot regions (1 million degrees!) with low density plasma, warm regions ("only" 6000-10000 Kelvin/Celsius) that can be gas atoms or plasma (or a mixture), and cold regions (less than 100 Kelvin or -200 Celsius) with gas molecules. So you can get all kind of complicated and interesting interactions, like hot gas crashing into clouds of cold gas, or blast fronts from old supernova explosions plowing through areas of warm gas (making it hotter and more compressed).

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VulcanVisions t1_iuk18o9 wrote

It was accidental evolution. Millions of different fruits evolved with different tastes, but some happened to be sweet.

The sweet ones were able to outcompete the non-sweet fruits because more animals ate the sweet ones, spreading their seeds.

This gave them a huge advantage in reproduction and eventually they became the more dominant fruit tree, and the fact that animals enjoyed them meant they would not die out.

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VulcanVisions t1_iuk0y86 wrote

When object A acts on object B, object B also acts on object A, but on the opposite way.

For example, picture a cat sitting on the floor.

The earth is pulling the cat down through gravity, but the cat is also pulling the earth up through its gravity.

These forces are opposite but equal to each other.

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YourSelf5454 t1_iuk0wun wrote

Mining engineer here,

Mining was the single most dangerous job in the world till about 1950. Old mines would use the change in temperatures combined with tunnels designed to encourage natural ventilation. A fire could be started that would "draw in air" and a smoke shaft would be built.

In 2022 we use 2000 hp fans to keep things cool/ clean air. Some extremely deep mines I have been to legit use the largest air-conditioning system the world has to keep the temp at a cool 120F its so hot 5000ft underground

Look at this graph of deaths each year in USA mining

https://www.minesafetycenter.com/mine-fatalities-progress/

Feel free to ask any other mining questions

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