Uranium

Does our sun have Uranium ?

 

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NO

 

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Based on your answer could I say the planet earth is older then the Sun ?

 

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No, some of the elements within the Earth are older than the Sun, but that doesn't mean the planet is older than the Sun. And by the same token, the elements inside the Sun are older than the Sun. The Sun isn't a first generation star. It's a second or third generation star and doesn't produce heavy metals because it lacks sufficient mass.

 

About74% of the sun is hydrogen and 25% is helium the rest is trace elements. There is some uranium in the sun as well as most other elements but just a very small amount.

 

So what is the explanation we have a relative small amount of Hydrogen in relation to the sun, but have a large content of uranium and its by product Lead.

 

Our Helium is very small tin relation to the sun , but we have large content of Carbon Oxygen which are product of Fusion.

 

?????

 

No, Sun is not expected to have. In mainstream stars due to Gravitational compact we cannot expect to go beyond Fe (Atomic Number 26), because after that fusion process needs energy. So formation of heavier elements becomes a mystery. There are certain theories like Supernova nucleon-synthesis, neutron capture, r process etc, please refer to them, you will get a better and detailed idea on this. I am not sure if any trace of Uranium is found on the Sun, as suggested by Origin.

 

As a 3rd generation star, I'd expect it would be likely to have as much as any planet in our solar system?

 

It's trivially obvious that given a common, heavy-element salted proto-stellar cloud for solar system, there would be some U within sun and all planets, moons, asteroids etc. How much survives within sun is obviously going to be on a 'best-estimate' basis. This scholarly article suggests a surprisingly low value of ~ 10^-12 that of H:
http://www.world-nuclear.org/info/N...nium-Resources/The-Cosmic-Origins-of-Uranium/
Estimates of more common element abundances (not specified as to average, or just spectroscopic thus surface abundances):
http://www.space.com/17170-what-is-the-sun-made-of.html

 

Well, the solar system isn't homogeneous. Why do we have gas giants like Jupiter in the solar system? The solar system isn't homogeneous. It's clumpy and the Earth is a clump whose atoms were formed by long dead stars. Gas and more specifically hydrogen gas is the most prevalent form of matter in the solar system. There is more of it. That's why we have the Sun and gas giants. There is just more of the lighter materials. Heavier atoms, the kinds of atoms which form the Earth are rarer. And actually, uranium is relatively rare on Earth accounting for. only 2.7 PPM of the Earth's crust.

I think you also have to remember how the Earth was formed. The Earth wasn't formed by a cloud of gas just floating around in space waiting to be forced into a union by the force of gravity as was the case with the Sun. The Earth was formed through a multitude of collisions with other bits of heavier matter (i.e. asteroids and planetoids). That's why the Earth is made of heavier materials and the Sun is made mostly of hydrogen gas. They were created differently through different processes of formation.

 

No, it's not a mystery really. We know we have the presence of elements heavier than Iron in the Universe and they had to come from somewhere, unless you are inferring "Shiva" did it?

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The theory that the heavier elements were synthesised in S/nova is far more than "just a theory" as you seem to be proposing. It is a scientific theory based on scientific evidence.
http://large.stanford.edu/courses/2013/ph241/roberts2/
Supernova and Heavy Elements
In order for heavy elements like uranium to be formed, a rapid supply of energetic neutrons must be made available. This is what a supernova explosion is capable of providing. The explosion is initiated by an excessive pressure build up about the iron core, and rapid compression ensues. The gravitational force overcomes the electron degeneracy pressure and begins to drive endothermic (energy consuming) reactions. A process occurs where protons in the nuclei capture electrons and become a neutron. This happens until a sufficient core of neutrons has been built up, reaching a state of neutron degeneracy. [4] The compression wave then bounces off of the neutron core and reflects back as an outward propagating shockwave, travelling at a significant fraction of the speed of light. [3]

As the shockwave moves outward, it passes through various layers: first a dense neutron gas, then the equilibrated iron region, followed by a number of still fusing layers of silicon burning, carbon and oxygen burning, helium burning, and hydrogen burning. The outermost layer is still primarily non-fusing hydrogen. [4] Through each layer that the shock wave interacts, a host of nuclear reactions occur, most notably the rapid neutron capture process.

The r-process is called rapid with respect to the decay mechanisms available to heavy, unstable nuclei. Specifically, it is referenced to the time over which beta minus decay occurs, in which a neutron within the nucleus converts into a proton and emits an electron (and a neutrino). This allows very large nuclei to accumulate in number. The r-process is contrasted with the s-process, a slow neutron capture mechanism, which does not require a supernova explosion to initiate. This process is capable of producing heavy elements up to lead and bismuth, roughly four times the mass of iron. However, the very heavy elements like uranium require the r-process to be formed. [4]

The result of a supernova explosion is that heavy elements are ejected out into space, and are available material for the formation of other celestial objects. Through the natural decay rates of heavy elements, time scales can be estimated for when supernova events may have happened. A few particularly useful elements have half-life decay times on the order of 108 to 1010 years, and they are used in a method called cosmochronology. The useful isotopes for dating nucleosynthesis events that created Earth's material are U-235 and U-238, which have half-lives of 7.13 × 108 and 4.51 × 109 years, respectively. The present day ratio of these two isotopes is roughly U-235/U-238 = 0.007. Given their decay rates, the abundance of these elements at the time the solar system formed (roughly a billion years ago) should have been about 0.3. Within a supernova explosion, models predict that the production ratio should be approximately 1.5. Thus, depending on how many supernova explosions contributed to the abundance of uranium isotopes we see today, the time of their occurrence is estimated to be from 2 billion years ago (if only a single supernova) to 10 billion years ago. [4] Given the timescales discussed above, it is interesting to ponder with respect to the present understanding for the age of the visible universe, which is ~13.77 billion years. [5]


In effect and as far as I know, there is no known other method [other than Shiva

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] to explain the existence of the "heavier than Iron" elements.
But I'm listening if you are privileged to some extraordinary knowledge that world wide physicists are not.

 

You should control your urge to copy material and then paste here. Process was referred to him and you could have allowed the OP to find it for himself and understand ? But no, you have to poke your fuckin nose everyhwere without knowing abcd!!

 

Wow!!!

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My urge to copy n past is eternal and will continue to support my statements, particularly against your own error ridden unsupported claims.
Alrighty?

 

Good, atleast you admitted that your copy pastes are basically driven by your 'compulsive urge' to post something.

 

No urge, more a necessity.
And to refute your silly half arsed statements like "It's still a mystery"

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Apparently the earth was formed in the region were there was material of higher density then were was formed the sun and jupiter. The indication of gaseous planet or a sun are formed in an region were no supernova have taken place , So I would suspect the earth is older then the sun and Jupiter.
Apparently the Uranium in the earth is not only on the crust , there is probable a larger quantity then estimated because we have high temperature in the mantle, volcano are an indication of heat generation beneath the the crust.