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Is Sun made of #Gold ? #askNostr

The density at the inner edge of the Sun's radiative zone is approximately 20 g/cm³. This is remarkably close to the density of gold, which is 19.32 g/cm. The radiative zone can be considered a wrapper around the Sun's nuclear core. It is a distinct layer that surrounds the core, extending from the outer edge of the core to about 70% of the Sun's radius. However, this distance seems tiny when we consider the time it takes for photons traveling at the speed of light.

To pass through the Sun's radiative zone is estimated a photon takes between 100,000 to 170,000 years. Which means Sun's Radiative zone is about 130 ,000 light years - give or take !

x92vbb 10mo ago

No, the sun is mostly of hydrogen.

That the light needs >100,000 years to pass a certain inner area doesnt mean that the radius of this inner area is >100,000 lightyears.

The light just travels incredibly slow due to the sun's "gravity", while a lightyear as a distance unit refers to the speed of light in a vacuum.

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Discussion

Satosha 10mo ago

At such (magnitude) of distances, our notion of miles (and kilometers) has no kinda breaks down ...

For example , inside a black hole - time stops - because light can't travel at all due to gravity .. for all practical purposes (if there is one :-) the black hole, thus, has infinite distance ( universal scale) with in it .. quite possible we are inside a black hole - information is encrypted on the event horizon in n-1 dimension ..

Btw - in radiative zone , light doesn't slow down , it is that a photon is consumed by tightly packed nucli as soon as it walks (at the speed of light) for one mm ...

Satosha 10mo ago

The other way to think about radiative zone is ..

The X and Gamma rays in Sun's core are so strong that they wouldsimply pass through Earth .. making a tiny hole all through ..In Sun's radiative zone they barely move one mm .. density and pressure .. it's like 300000 km thick cover of Gold circling around core .. gradually reducing in density as we go outwards

x92vbb 10mo ago

I hope one day mankind can achieve a Dyson sphere.

senf 10mo ago

Light can travel in a black hole, it just has no path that leads outside of the event horizon.

Satosha 10mo ago

Agree .. it travels in circles .. but we don't know for sure if there is dense matter with in to hinder the progression of light .. must be high intensity gamma and X rays given the kind of fusion going on inside ..

senf 10mo ago

It's way past what we call fusion at that point. Neutron stars are less dense than black holes and don't do fusion (because it's already happened, they're basically one giant atomic nucleus already).

x92vbb 10mo ago

fascinating objects

Satosha 10mo ago

Singularity is the Observer ..

x92vbb 10mo ago

Maybe he was referring to the singularity, not event horizont.

Definition of "black hole" is a bit confusing.

senf 10mo ago

It doesn't take that long because of gravity, it's the path taken to the surface.

https://www.astronomy.com/science/i-heard-that-the-light-from-nuclear-fusion-reactions-in-the-suns-core-takes-about-200000-years-to-reach-its-surface-i-thought-the-speed-of-light-is-constant-why-does-it-take-so-long/

x92vbb 10mo ago

You're absolutely right, I might have simplified it too much ("gravity" in quotes) though the fusion which causes the radiation is at last caused by the immense gravity.

But your shared link explains it better than I could. 👍🤗