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1 day ago · 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.
3 days ago · Find the Sun in the sky using our online planetarium web application.
1 day ago · This image shows sun activity – with the most active regions labeled – as of 0 UTC on July 25, 2024. Original image, without labels, via NASA SDO. Courtesy of NASA/SDO and the AIA, EVE, and...
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3 days ago · Astronomy Picture of the Day. Each day a different image or photograph of our fascinating universe is featured, along with a brief explanation written by a professional astronomer. 2024 July 23.
1 hour ago · 6 beautiful 'Astronomy Pictures of the Day' shared by NASA. Shivam Verma. These cosmic clouds have blossomed 1,300 light-years away in the fertile starfields of the constellation Cepheus. Bright-rimmed, flowing shapes gather near the center of this rich starfield toward the borders of the nautical southern constellations Pupis and Vela.
2 days ago · The sun’s activity goes up and down every 11 years. During this cycle, it has more sunspots and solar flares when it is active, and fewer when it is less active. This pattern is known as the solar cycle. A remarkable fact about the sun is that it contains 99% of all the material in our solar system. Everything else, including planets ...
5 days ago · Sunspot, vortex of gas on the surface of the Sun associated with strong local magnetic activity. Spots look dark only by contrast with the surrounding photosphere, which is several thousand degrees hotter. The dark centre of a spot is called the umbra; the outer, lighter ring is the penumbra.
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