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2006-10-24 03:07:56 · 16 answers · asked by Anonymous in Social Science Other - Social Science

16 answers

Hydrogen and Helium

The core of the Sun is considered to extend from the center to about 0.2 solar radii. It has a density of up to 150,000 kg/m3 (150 times the density of water on Earth) and a temperature of close to 15,000,000 Kelvins (by contrast, the surface of the Sun is close to 6,000 Kelvins). Energy is produced by exothermic thermonuclear reactions (nuclear fusion) that mainly convert hydrogen into helium, helium into carbon, carbon into iron. The core is the only location in the Sun that produces an appreciable amount of heat via fusion: the rest of the star is heated by energy that is transferred outward from the core. All of the energy produced by fusion in the core must travel through many successive layers to the solar photosphere before it escapes into space as sunlight or kinetic energy of particles.

About 8.9×1037 protons (hydrogen nuclei) are converted into helium nuclei every second, releasing energy at the matter-energy conversion rate of 4.26 million tonnes per second, 383 yottawatts (383×1024 W) or 9.15×1010 megatons of TNT per second. The rate of nuclear fusion depends strongly on density, so the fusion rate in the core is in a self-correcting equilibrium: a slightly higher rate of fusion would cause the core to heat up more and expand slightly against the weight of the outer layers, reducing the fusion rate and correcting the perturbation; and a slightly lower rate would cause the core to cool and shrink slightly, increasing the fusion rate and again reverting it to its present level.

The high-energy photons (gamma and X-rays) released in fusion reactions take a long time to reach the Sun's surface, slowed down by the indirect path taken, as well as by constant absorption and reemission at lower energies in the solar mantle. Estimates of the "photon travel time" range from as much as 50 million years to as little as 17,000 years. After a final trip through the convective outer layer to the transparent "surface" of the photosphere, the photons escape as visible light. Each gamma ray in the Sun's core is converted into several million visible light photons before escaping into space. Neutrinos are also released by the fusion reactions in the core, but unlike photons they very rarely interact with matter, so almost all are able to escape the Sun immediately. For many years measurements of the number of neutrinos produced in the Sun were much lower than theories predicted, a problem which was recently resolved through a better understanding of the effects of neutrino oscillation.

2006-10-24 03:10:47 · answer #1 · answered by Anonymous · 5 0

My all-time favorite answer to this question:

"The sun is a mass of incandescent gas
A gigantic nuclear furnace
Where Hydrogen is built into Helium
At a temperature of millions of degrees"

"The sun is so hot that everything on it is a gas.
Aluminum, Copper, Iron, and many others"

"Scientists have found that the sun is a huge atom smashing machine, The heat and light of the sun are caused by nuclear reactions between Hydrogen, Nitrogen, Carbon, and Helium"

These are lines from a song by Lou Singer and Hy Zaret, 1959, which was covered by the band They Might Be Giants in 1993.

2006-10-24 04:40:51 · answer #2 · answered by Lyd 1 · 0 0

the interior of the sun is mainly made up of hydrogen.the temperature of the the sun is about 2 x10 raised to 7 degree celsius.at this extremely high temp the hydrogen nuclei undergo nuclear fusion.in this process 4 hydrogen nuclei combine to form one helium nucleus.large no. of helium nucleus are being formed in the sun so large amount of heat and light is liberated(its the energy liberated)
i hope u have got ur answer.

2006-10-24 05:10:06 · answer #3 · answered by Anonymous · 0 0

The solar merely like all action picture star, they're produced from Hydrogen and stellar dirt, the celebs and the solar fuse Hydrogen into Helium, and whilst the Hydrogen starts off working out the solar will initiate fusing the Helium and at that factor the solar will swell right into a pink vast, then after some years the solar will blow off it extremely is outer gases then compress right down to a dwarf action picture star and start to kick back till is is chilly, and all it is going to leave is a planetary nebula.

2016-11-25 01:58:30 · answer #4 · answered by ? 4 · 0 0

The sun is madr up of 55% hydrogen, 44% helium and 1% from other gases.

2006-10-24 03:13:28 · answer #5 · answered by Berhane Gebreyesus Habtu 4 · 0 0

Sun is made up of mainly hydrogen and helium gases. Its a star just like other stars which is very near to us. These two gases undergoes fusion and produce lots of heat and light.

2006-10-24 03:41:42 · answer #6 · answered by indu_kain 2 · 0 0

Basically it is made up of Hydrogen and Helium

The core of the Sun is considered to extend from the center to about 0.2 solar radii. It has a density of up to 150,000 kg/m3 (150 times the density of water on Earth) and a temperature of close to 15,000,000 Kelvins (by contrast, the surface of the Sun is close to 6,000 Kelvins). Energy is produced by exothermic thermonuclear reactions (nuclear fusion) that mainly convert hydrogen into helium, helium into carbon, carbon into iron. The core is the only location in the Sun that produces an appreciable amount of heat via fusion: the rest of the star is heated by energy that is transferred outward from the core. All of the energy produced by fusion in the core must travel through many successive layers to the solar photosphere before it escapes into space as sunlight or kinetic energy of particles.

About 8.9×1037 protons (hydrogen nuclei) are converted into helium nuclei every second, releasing energy at the matter-energy conversion rate of 4.26 million tonnes per second, 383 yottawatts (383×1024 W) or 9.15×1010 megatons of TNT per second. The rate of nuclear fusion depends strongly on density, so the fusion rate in the core is in a self-correcting equilibrium: a slightly higher rate of fusion would cause the core to heat up more and expand slightly against the weight of the outer layers, reducing the fusion rate and correcting the perturbation; and a slightly lower rate would cause the core to cool and shrink slightly, increasing the fusion rate and again reverting it to its present level.

The high-energy photons (gamma and X-rays) released in fusion reactions take a long time to reach the Sun's surface, slowed down by the indirect path taken, as well as by constant absorption and reemission at lower energies in the solar mantle. Estimates of the "photon travel time" range from as much as 50 million years to as little as 17,000 years. After a final trip through the convective outer layer to the transparent "surface" of the photosphere, the photons escape as visible light. Each gamma ray in the Sun's core is converted into several million visible light photons before escaping into space. Neutrinos are also released by the fusion reactions in the core, but unlike photons they very rarely interact with matter, so almost all are able to escape the Sun immediately. For many years measurements of the number of neutrinos produced in the Sun were much lower than theories predicted, a problem which was recently resolved through a better understanding of the effects of neutrino oscillation.

2006-10-24 03:16:14 · answer #7 · answered by Kasie Faith 2 · 0 0

Indiachildren - Children's Corner (Universe and Earth)
... our solar system the Sun is the largest body, which is made up of hydrogen and some helium. ... it is because of the heat released by burning hydrogen that ...
http://www.indiachildren.com/learn/tellmemore/universe.htm

2006-10-28 00:11:16 · answer #8 · answered by Krishna 6 · 0 0

mostly hydrogen and helium with a smattering of other elements once the hydrogen is used up the sun will burn its helium and start to expand but not to worry...you and I will be long gone from this earth when that happens
Earth&sky.org

2006-10-24 03:12:10 · answer #9 · answered by regg 2 · 0 0

Mainly Hydrogen, with some Helium, and lots of different trace elements.

2006-10-24 03:10:27 · answer #10 · answered by Carter S 2 · 0 1

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