Sun
The Sun is the star at the center of the Solar System. It is a massive, nearly perfect sphere of hot plasma, heated to incandescence by nuclear fusion reactions in its core, radiating the energy from its surface mainly as visible light and infrared radiation with 10% at ultraviolet energies. It is by far the most important source of energy for life on Earth. The Sun has been an object of veneration in many cultures. It has been a central subject for astronomical research since antiquity.The Sun orbits the Galactic Center at a distance of 24,000 to 28,000 light-years. From Earth, it is () or about 8 light-minutes away. Its diameter is about (), 109 times that of Earth. Its mass is about 330,000 times that of Earth, making up about 99.86% of the total mass of the Solar System. Roughly three-quarters of the Sun's mass consists of hydrogen (~73%); the rest is mostly helium (~25%), with much smaller quantities of heavier elements, including oxygen, carbon, neon, and iron.
The Sun is a G-type main-sequence star (G2V), informally called a yellow dwarf, though its light is actually white. It formed approximately 4.6 billion years ago from the gravitational collapse of matter within a region of a large molecular cloud. Most of this matter gathered in the center, whereas the rest flattened into an orbiting disk that became the Solar System. The central mass became so hot and dense that it eventually initiated nuclear fusion in its core. Every second, the Sun's core fuses about 600 billion kilograms (kg) of hydrogen into helium and converts 4 billion kg of matter into energy.
About 4 to 7 billion years from now, when hydrogen fusion in the Sun's core diminishes to the point where the Sun is no longer in hydrostatic equilibrium, its core will undergo a marked increase in density and temperature which will cause its outer layers to expand, eventually transforming the Sun into a red giant. This process will make the Sun large enough to render Earth uninhabitable approximately five billion years from the present. After the red giant phase, models suggest the Sun will shed its outer layers and become a dense type of cooling star (a white dwarf), and no longer produce energy by fusion, but will still glow and give off heat from its previous fusion for perhaps trillions of years. After that, it is theorized to become a super dense black dwarf, giving off negligible energy. Provided by Wikipedia
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Temperature induces metabolic reprogramming in fish during bacterial infection by Bin Sun, Bin Sun, Boguang Sun, Boguang Sun, Beibei Zhang, Beibei Zhang, Li Sun, Li Sun, Li Sun
Published 2022-09-01
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Plant mercury accumulation and litter input to a Northern Sedge-dominated Peatland by T. Sun, T. Sun, T. Sun, B. A. Branfireun
Published 2023-07-01
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Recent Advances of Marine Natural Indole Products in Chemical and Biological Aspects by Haoyi Sun, Kangping Sun, Jingyong Sun
Published 2023-02-01
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Within-sample co-methylation patterns in normal tissues by Lillian Sun, Shuying Sun
Published 2019-05-01
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The relationship between numerosity perception and mathematics ability in adults: the moderating role of dots number by Ji Sun, Pei Sun
Published 2021-12-01
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Lidocaine inhibits proliferation and metastasis of lung cancer cell via regulation of miR-539/EGFR axis by Hai Sun, Yan Sun
Published 2019-12-01
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Design a patient monitoring system in health care using cluster-based hierarchical routing for green communication by Jing Sun, Xitao Sun
Published 2024-02-01
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The Way of Nature from the Perspective of Laozi, Confucius, and Sunzi by Jian Sun, Kody Sun
Published 2023-02-01
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Experimental Research on water driving oil of Natural Core Series Displacement Method by C Wang, Z Sun, Y Sun, Q Sun
Published 2021-01-01
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In situ U–Pb age determination of apatite from carbonatite and kimberlite in the Batain Basin, eastern Oman by Jing Sun, Jing Sun, Leiyin Jiang, Jiaxuan Sun
Published 2023-10-01
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Diversity and community structure of microzooplankton in the eastern Indian Ocean during the inter-monsoon period by Jian Zhai, Jian Zhai, Jun Sun, Jun Sun, Jun Sun, Jun Sun
Published 2023-11-01
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Developing Graphene Grids for Cryoelectron Microscopy by Hongcheng Fan, Hongcheng Fan, Fei Sun, Fei Sun, Fei Sun, Fei Sun
Published 2022-07-01
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