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Suns photosphere1/7/2024 ![]() The solar atmosphere is actually a vacuum by most standards the total density above any square centimetre is about 1 gram, about 1,000 times less than the comparable mass in the atmosphere of Earth. The density, about 10 −7 gram per cubic centimetre (g/cm 3), drops a factor of 2.7 every 150 kilometres. The temperature at the visible surface is about 5,800 K but drops to a minimum about 4,000 K at approximately 500 kilometres above the photosphere. This produces a dramatic drop in temperature and density. Photons flowing from below, trapped by the underlying layers, finally escape. Observe a dopplergram showing the velocity of solar material in the photosphere captured by the Helioseismic and Magnetic Imager See all videos for this articleĪlthough there are no fires on the surface of the Sun, the photosphere seethes and roils, displaying the effects of the underlying convection. SpaceNext50 Britannica presents SpaceNext50, From the race to the Moon to space stewardship, we explore a wide range of subjects that feed our curiosity about space!.Learn about the major environmental problems facing our planet and what can be done about them! ![]() Saving Earth Britannica Presents Earth’s To-Do List for the 21st Century.Britannica Beyond We’ve created a new place where questions are at the center of learning.100 Women Britannica celebrates the centennial of the Nineteenth Amendment, highlighting suffragists and history-making politicians.COVID-19 Portal While this global health crisis continues to evolve, it can be useful to look to past pandemics to better understand how to respond today.Student Portal Britannica is the ultimate student resource for key school subjects like history, government, literature, and more.From tech to household and wellness products. Britannica Explains In these videos, Britannica explains a variety of topics and answers frequently asked questions.This Time in History In these videos, find out what happened this month (or any month!) in history.#WTFact Videos In #WTFact Britannica shares some of the most bizarre facts we can find.Demystified Videos In Demystified, Britannica has all the answers to your burning questions.Britannica Classics Check out these retro videos from Encyclopedia Britannica’s archives.
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