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Physics, Astronomy & Cosmology / Re: What happens inside a black hole, and how do black holes evaporate?

« on: 27/09/2020 18:07:35 »

What happens to 'space' inside is that it conforms to gravity and 'shrinks'. And so do you and your meter stick, as defined from a outside far away. Not to you locally defined though. The same goes for the time component, as from a outside it 'slows down', and as the inside is a singularity the 'center' should be a place where a outside observer would say that your clock has stopped, as far as I see. And the same should then go for your 'size' as a guess. Aka, you 'disappeared'

Is that correct?

Space curvature causes gravity, which can be viewed as the elongation of space not the contraction. I understand Infinite space time curvature inside a blackhole, does not mean space shrinks to nothing.

No one knows what goes on inside a black hole, lots of speculations exist. To an outside observer the blackhole might appear to be small, but to someone inside, it might appear very very big. The blackhole itself likely rips apart molecules transforming them into photons creating a photon star inside the event horizon. 

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Physics, Astronomy & Cosmology / Re: What would I find in a square centimetre of space?

« on: 06/03/2020 09:33:08 »

As the title says, just what would I find in a square centimetre of space? If that bit of space was in the vacuum of outer space?

Not much, its a very low density, the content would vary but consist mainly of Neutrinos, Hydrogen, Helium, Lots of radiation, and virtual particles(zero point energy). The odd asteroid or comet might pass through your cubic centimeter of space also.

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Physics, Astronomy & Cosmology / Re: How Can This Black Hole Be So Big Ton 618 ?

« on: 20/08/2019 20:04:10 »

Perhaps the big bang model is not 100% correct,  and is perhaps more of a rough approximation to what happened in the early observable universe . Other models exist that point out little anomalies like this one and attempt to answer the questions.

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Physics, Astronomy & Cosmology / Re: How does gravity exert its influence infinitely?. Times two

« on: 01/08/2019 14:34:21 »

This theory explains what happens after the big bang and after the initial singularity, even though matter didn't exist , high density energy exited.
https://en.wikipedia.org/wiki/Inflation_(cosmology)

That link is misleading.
Try this one https://profmattstrassler.com/2014/03/17/my-new-articles-on-big-bang-inflation-etc/

Other models exist, which are also only theoretical. That indicate that as the expansion of space accelerates, and matter becomes separated another inflationary phase will be reached and another big bang will happen. forget the singularity, its a result of a outdated mathematical model. 

De sitter universe is interesting too, inflation will take place in the absence of mass and cause a big bang, if I understood it right. 

Edit a better link on inflation https://profmattstrassler.com/articles-and-posts/relativity-space-astronomy-and-cosmology/history-of-the-universe/inflation/

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Question of the Week / Re: QotW: 19.07.29 What causes monsoon rain and will global warming affect it?

« on: 26/07/2019 11:16:59 »

Global warming will warm the oceans, which will put more moisture in the atmosphere.
No one knows for sure how bad this will be.
Some areas MIGHT get more rain, and some areas less rain. 
Various models exist, southern Asia MIGHT get dryer according to this model https://journals.ametsoc.org/doi/full/10.1175/JCLI-D-12-00208.1

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Technology / Re: Why does the South American sewage system not cope with toilet paper?

« on: 03/07/2019 15:01:34 »

If there is no sewage farm locally, to eficiently deal with the waste then certainly in rural areas they will be using septic tanks, which don't like detergents and toilet paper. If a septic tank is working fine it will digest most of the waste going into it, but it is not as efficient as a sewage farm.

https://en.wikipedia.org/wiki/Septic_tank

Problems with ground water can be an issue, when septic tanks are used. If the water storage is above the septic tanks then there isn't really a problem, ie when the water comes from mountain lakes, on coral atolls however where the drinking water is below the level of any septic tanks then the tanks have to be sealed and emptied to get rid of liquids. Similarly disposal of any kind of waste, human bodies etc can be an issue when ground water is being pumped up from below the level of where the waste is disposed of. Bodies need to be buried in concrete lined graves on some coral atolls to prevent them from decomposing and contaminating into the water systems below.  The island of Nuie for example do this to prevent contaminating the water supply.

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Plant Sciences, Zoology & Evolution / Re: Why do gulls and crows go after eagles?

« on: 29/06/2019 10:55:52 »

Eagles can take out bigger prey also. I witnessed a pair of sea eagles force a parasail to the ground in north wales of a few years ago. They hung from the shoot collapsing it, forcing the para sailor to land. Once landed they left him alone.

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Plant Sciences, Zoology & Evolution / Re: What trees or plants are most efficient at storing carbon?

« on: 13/04/2019 22:58:15 »

Are some better than others?

Depends how you look at it, all plants return the CO2 back to the atmosphere eventually. https://www.sciencefocus.com/nature/are-some-plants-better-than-others-at-sucking-up-carbon-dioxide/
Fast growing plants have short lives but take up CO2 faster than slower growing plants, which live much longer keeping the CO2 locked in longer.

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Physiology & Medicine / Re: what does a bubbling sensation under the skin mean?

« on: 03/04/2019 17:01:33 »

It could just be involuntary muscle spasms. Or something more serious, https://en.wikipedia.org/wiki/Gas_gangrene

More info is required

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Famous Scientists, Doctors and Inventors / Re: Who invented the dildo?

« on: 17/03/2019 17:56:06 »

I guess some one just wanted to play around, and were told to keep their fingers out.

Or

Perhaps it has older origins 1500 th century, with witches broomsticks https://hyperallergic.com/332222/first-known-depiction-witch-broomstick/

Or perhaps it started with an enjoyable slip up / accident

sorry I needed 10 posts, the link works now thanks Colin