Sensei

I think so, in our deliberations, we can safely exclude outermost layers of the Sun (where the density is less than water on Earth), and concentrate just on the solar core. Mass of the core is 34% of Msun = 0.34 * 1.9885×1030 kg = 6.761*10^29 kg Radius of the core is ~20% of Rsun = 0.2 * 696,342,000 m = 139,268,400 m So, using your above escape velocity from the center of object, we are getting: v2 = 3 * 6.67*10^-11 * 6.761*10^29 / 139,268,400 = ~9.714*10^11 v=sqrt( 9.714*10^11 ) = ~ 985,600 m/s = ~1 million m/s = ~1000 km/s

Escape velocity equation (from surface and further) is: [math]v=\sqrt{\frac{2 G M}{r}}[/math] for any M, we can find any such so small r, after reaching it, escape velocity is equal or exceeding c. So, for the Sun, it'll be: [math]r=\frac{2 * 6.67*10^{-11} * 2*10^{30}}{299792458^2}[/math] approximately 2968 meters. Multiply by millions and billions of years sucking in any (hypothetical) DM, and these Msun and Mearth must already have it included.. I think so escape velocity equation has sense only from object's surface and further. If (electric neutral) particle is inside (passing through) of e.g. star or planet or other object, it's attracted from the all directions, and calculation which is just toward center of it, is at least "imprecise".. I said concentration, not quantity. Concentration requires both quantity and volume.

Maybe you should make article and make it sticky what dimension means in physics.. so they won't confuse it with sci-fi vision of other dimensions..

@John Cuthber Nope. In previous post, you mixed up Theresa May with Thatcher and now just pretending that during writing words ("It's not so long since we had a prime minister who studied quantum mechanics. (...)") you meant Thatcher, when you realized your mistake after I pointed out that education of May is geography.. Nobody would use "not so long" for something that happened over thirty years ago. https://www.merriam-webster.com/dictionary/not long ago

1) take checkered paper 2) pick up some random points x1,y1 and x2,y2 (integers to have easier the next step) 3) draw line passing through these points (single cell of checkered paper is 1x1 in x and y units) 4) think I think that visualization of this is essential to understanding what equation should be made..

Who are you talking about? On neither Theresa May nor Margaret Thatcher Wikipedia profiles there is not a single word about "quantum", "physics" nor "mechanics".. On May's private website there is not a single word about it either.. Weird. https://www.tmay.co.uk/about Just Geography at Oxford. Physics is not mentioned any single time on the list of finished education of UK prime ministers either. Weird. https://en.wikipedia.org/wiki/List_of_Prime_Ministers_of_the_United_Kingdom_by_education Margaret Thatcher wiki "She studied chemistry at Somerville College, Oxford, and worked briefly as a research chemist, " ("not so long ago" for "30 years ago" is weird statement in the mouth of human being like you, even if you conflated (mixed up?) "quantum mechanics" with "chemistry") ..but that position is already taken by you..

You can attach image in reply on this forum, if it is absolutely required. Below editor you have field with "Drag files here to attach, or choose files..."

Decreased amount of matter (on the right side of equation) is accompanied by decrease of volume (on the left side of equation). Radius of sphere you know from mathematics.

Any object with temperature T is emitting photons. How much energy have these photons depend on temperature of the body. Your biological body is also emitting infra-red photons (therefor one can use IR thermometer to remotely check temperature, or IR camera to detect people or animals from longer distance). If body is enough hot, there are emitted visible photons (and your eyes are able to detect them as light). Please read black-body radiation article on Wikipedia for more details about this subject: https://en.wikipedia.org/wiki/Black-body_radiation

In the worst case scenario (opposite side of the Earth) it is 2 * 20,000 km / 300,000 km/s = 0.133 s... plus delays caused by hardware.. With satellite transmission (instead of underwater oceanic fiber wire) it would be even worse.

That requires extremely well educated population, extremely well informed, extremely well understanding everything.. ..if population is intelligence, quantum physicists, you cannot lie to us... (one can try, but the only thing you will get is smile, which can be interpreted "I know you are telling BS") Merkel graduated quantum chemistry, her husband too... what UK have.. ? I said to somebody here, Merkel is the only politician who could speak with me... (the rest would not have idea what I am talking about anyway so waste of my time)

@Raider5678 Absolutely. Descriptive variable names, descriptive class names, descriptive structure names, descriptive constants etc. etc. are essential for readable and maintainable in the future source code.. ps. Example from my yesterday project: context.getString( R.string.voiceedittext_speech_error_insufficient_permissions ); .... I don't need to comment, I hope so..

I think, you are not entirely fair with them. Any (at high enough position) politician is liar.. Without lying to people, they would not get votes and sustain position.. Promising something which they cannot do, or don't want to do, or doing it would be plain stupid, I also consider as "lying to people".

Charged fermions react to external electric and/or magnetic fields. Uncharged fermions i.e. neutrinos interact via weak-force (and gravity)..

...that is why in my previous response, not with a reason, I imagined black hole... i.e. escape velocity from black hole is >= speed of light..

These "clumps of matter" are made of ordinary matter i.e. black holes, stars and planets.. Already.. i.e. they are source of gravity which should attract whatever else what reacts only to gravity.. You described situation in which DM is alone (and does not interact even with itself), without any ordinary matter around.

If dark matter reacts only to gravity, the largest concentration of it should be inside of black holes, stars, and planets. In the core center...

Thick atmosphere = large pressure of atmosphere at the surface.. Habitable for human being is the not same as habitable to any organic life form and even less for inorganic forms.. Supply of energy might be due to planet's internal activity e.g. volcanoes, tidal forces etc.

...my "discussions" with Jehovah's Witnesses (and Christian archbishop as well etc) looked like I described in this thread:

BTW, you missed the point. 1) Politician is using emotion as a tool to persuade usually less knowledgeable peoples to his or her vision. Emotions, made by enthusiastic speech of leader, are appearing in heads of people listening it, they start e.g. identifying as victims and/or targets, and they start agreeing with it 2).... If I tell miners that they will have to change their, quite well paid job, in coalmine to something else, they obviously will be upset, angry, reluctant to accept it.. Either leader accepting man-made global climate change, and leader rejecting man-mane global climate change, would have to tell this to coal miners! But denier of climate change will do it in such a way that miners will be all against switch to renewable energy sources. Emotional speech will be tool to convert them to his or her side, regardless of what happens with the Earth. People usually bothers only about their own and their family fate. Especially non-intellectuals.. When I said "emotion is bad advisor", I was thinking about people listening to politicians leader speech. ..therefore people should be intellectuals in the first place, so they will use less emotions, and rely more on their own brain and intellect.. They will be less susceptible to manipulation and less selfish (I hope naively)..

1) build prototype 2) measure and record db from both a) physical resistor b) prototype 3) compare and show results here on the forum...

Did you miss the bit about that they made their own home-made experts in fields, and promoted them by booking them in their TV channels, over and over again... ? You can ask physics Nobel prize winner to explain things in CNN, but only CNN audience etc will watch it, so no Fox News audience etc will learn anything new from it.. Fox News will ask their "expert" to explain their audience the same thing using their own "science".. Get the picture now? You believe in that our global climate change made by human issue is reaching the right audience, because it is supported by scientists etc. No, it is not. They have their own brain-washing home-made experts who are telling them crap on TV, Internet, radio, etc etc. I'm not a politician, so I don't have to cuddle (ingratiate) with anyone...

Opposite side can use emotions more efficiently than you can. They are already on positions, just trying to keep status quo. They can say to coal miners they will lose jobs. Say to oil industry engineers, coal power plants engineers etc. they will lose jobs. Say to anybody working in coal, gas, fossil fuels, production, distribution, marketing, etc. they will lose jobs. They will lose jobs they have right now. What can you offer them? Nothing. Because they have to learn new things, learn new jobs, make new investments, change their entire settled down life, to adopt to new, unknown, renewable energy sources.. "masses" should be intelligence.. who understand, being able to analyze provided (independent and reliable) data, being able to gather their own (independent and reliable) data, being able to make their own independent decisions, not based on their own personal and family interests, and keeping status quo just to get flow of money whatever happens with them.. "hard candy" ..your "masses" are easy to be manipulated by anybody.. e.g. politicians will scary them with immigrants (emotion: fear)..

..there were emotions when D.T. withdraw US from Paris agreement.. https://www.theguardian.com/environment/2017/jun/01/trump-withdraw-paris-climate-deal-world-leaders-react ..emotion is bad advisor.. (reminds me hitler's speeches.. full of emotions) ..absolutely everything is wrong if you use emotions instead of logical thinking... ..opposite side have self-made "experts" from flat-Earth, anti-climate deniers experts, anti-vaccines, and so on, so on.. Self-made experts are booked by their TV channels to express their s**t to audience and stupefy them..

It's not appropriate timing for polite speeches, stroking the head, selfies etc when your home is burning..