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24 Απρ 2017 · Virtually all life on Earth is sustained by energy from sunlight. This energy is transmitted from sun to Earth in the form of electromagnetic radiation emitted by hot gas at the sun's surface. The sun is heated by nuclear fusion taking place within its core.
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The sun, an average, middle-aged star, provides the Earth...
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- Facts About The Sun's Core
How the Sun produces this energy was a key question that challenged many scientists over the years. It emits about 3.8 × 10 26 joules every second. Calculations easily showed that this could not be due to combustion or some normal chemical reaction - it would have used up its fuel long ago.
24 Ιουν 2020 · This carbon–nitrogen (CN) reaction is not the Sun’s only fusion pathway: it produces less than 1% of the Sun’s energy. But it is thought to be the dominant energy source in larger stars.
8 Ιαν 2024 · Nuclear fusion in the sun involves the merging of lighter atomic nuclei to form a heavier one, releasing energy. In contrast, nuclear fission, as observed in nuclear power plants, involves the splitting of heavy atomic nuclei into lighter ones.
Nuclear reactions inside the Sun, as in all stars, do two important things: they generate energy, and they gradually change the Sun's composition because they build up increasingly heavy nuclei. The temperature inside the Sun is so high that electrons have all been stripped from their atomic nuclei.
25 Οκτ 2021 · The energy of the Sun comes from the fusion of hydrogen into helium. Nuclear fusion requires that like-charged nuclei get close enough to each other to fuse. Under normal conditions, the electromagnetic repulsion between two protons keeps them from coming close enough to stick together.
10 Απρ 2022 · Solar energy is produced by interactions of particles—that is, protons, neutrons, electrons, positrons, and neutrinos. Specifically, the source of the Sun’s energy is the fusion of hydrogen to form helium. The series of reactions required to convert hydrogen to helium is called the proton-proton chain.
