From far away, the cloud looks as if it has a sharp surface, but you do not feel a surface as you fall into it. The corona is the outer atmosphere of the Sun, which is much larger in volume than the Sun itself. The convective zone is the outermost layer of the solar interior. The bright granules are columns of hotter gases rising at speeds of 2 to 3 kilometers per second from below the photosphere. In 2013, NASA launched the Interface Region Imaging Spectrograph (IRIS) to study the transition region to understand better how and why this sharp temperature increase occurs. (credit: modification of work by NASA/Goddard), This photograph shows the photosphereâthe visible surface of the Sun.
The outermost part of the Sunâs atmosphere is called the corona. In the seventeenth century, several observers described what appeared to them as a narrow red âstreakâ or âfringeâ around the edge of the Moon during a brief instant after the Sunâs photosphere had been covered. Except where otherwise noted, textbooks on this site Although this sounds like a lot, itâs so trivial compared to the enormous mass of the Sun that it can be neglected as we study the Sun. Today, students are probably most familiar with it as the light gas used to inflate balloons, although it turns out to be the second-most abundant element in the universe. Where did these elements come from? Creative Commons Attribution License 4.0 license. are licensed under a, Observing the Sky: The Birth of Astronomy, Observations outside Earthâs Atmosphere, Other Worlds: An Introduction to the Solar System, Life, Chemical Evolution, and Climate Change, Cosmic Influences on the Evolution of Earth, Comets and Asteroids: Debris of the Solar System, The Origin and Fate of Comets and Related Objects, Cosmic Samples and the Origin of the Solar System, Sources of Sunshine: Thermal and Gravitational Energy, Mass, Energy, and the Theory of Relativity, Using Spectra to Measure Stellar Radius, Composition, and Motion, Variable Stars: One Key to Cosmic Distances, The Birth of Stars and the Discovery of Planets outside the Solar System, The HâR Diagram and the Study of Stellar Evolution, Evidence That Planets Form around Other Stars, Planets beyond the Solar System: Search and Discovery, Exoplanets Everywhere: What We Are Learning, Evolution from the Main Sequence to Red Giants, Evolution of Massive Stars: An Explosive Finish, Pulsars and the Discovery of Neutron Stars, Active Galaxies, Quasars, and Supermassive Black Holes, Supermassive Black Holes: What Quasars Really Are, Quasars as Probes of Evolution in the Universe, The Evolution and Distribution of Galaxies, Galaxy Mergers and Active Galactic Nuclei, The Formation and Evolution of Galaxies and Structure in the Universe, The Search for Extraterrestrial Intelligence, How to Study for an Introductory Astronomy Class, Physical and Orbital Data for the Planets, The Nearest Stars, Brown Dwarfs, and White Dwarfs, Here, Earth is shown to scale with part of the Sun and a giant loop of hot gas erupting from its surface.
The core is approximately 20% of the size of the solar interior and is thought to have a temperature of approximately 15 million K, making it the hottest part of the Sun. The Sunâs layers are different from each other, and each plays a part in producing the energy that the Sun ultimately emits. The core has a radius of 750 miles. Design & Strategic Development by THE BRAND BUILDER TOOLBOX with Virtuallinda, Design & Strategic Development by THE BRAND BUILDER TOOLBOX with Virtuallinda, Equinox - 9:30 a.m. EDT (1330 UTC/GMT) on Tuesday, September 22, 2020, then there is the visible surface known as the.
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