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Sun
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Joshua Tree National Park solar system to scale Inland Sea photosphere of the Sun Planets of Our Solar System
How to watch a solar eclipse
Explore the physics behind nuclear fusion and the Sun
evolution of a Sun-like star internal rotation of the Sun
Observe a dopplergram showing the velocity of solar material in the photosphere captured by the Helioseismic and Magnetic Imager
For Students
imaging using ultraviolet light
Sun summary
Quizzes
View of the Andromeda Galaxy (Messier 31, M31).
Astronomy and Space Quiz
The orbits of the planets and other elements of the solar system, including asteroids, Kuiper belt, Oort cloud, comet
Space Odyssey
Ursa major constellation illustration art. (Big Dipper) stars, space, night sky)
Stars: Explosions in Space
1 July 2002: The Solar and Heliospheric Observatory (SOHO) satellite reveals a massive solar eruption more than 30 times the Earth's diameter. The eruption formed when a loop of a magnetic field over the surface of the Sun trapped hot gas.
Brightest Star in the Solar System
Nicolaus Copernicus. Nicolas Copernicus (1473-1543) Polish astronomer. In 1543 he published, forward proof of a Heliocentric (sun centered) universe. Coloured stipple engraving published London 1802. De revolutionibus orbium coelestium libri vi.
All About Astronomy
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Colorful winter sunset
What's the Difference Between a Solstice and an Equinox?
solar eclipse, sun, moon, astronomy, space
How Do You Tell the Difference Between Total, Annular, Solar, and Lunar Eclipses?
Discover
Ice Sledge Hockey, Hockey Canada Cup, USA (left) vs Canada, 2009. UBC Thunderbird Arena, Vancouver, BC, competition site for Olympic ice hockey and Paralympic ice sledge hockey. Vancouver 2010 Olympic and Paralympic Winter Games, Vancouver Olympics
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Four year old boy with grandfather and father lighting Hanukkah menorah. Photo taken on: December 21st, 2009
Which Is Correct: Hanukkah or Chanukah?
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Close-up of ostriches (Struthio camelus) necks and heads; location unknown.
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Watergate scandal. Richard M. Nixon. President Nixon gives a press conference and talks to the press, March 12, 1971.
9 American Political Scandals
Joshua Tree National Park
Joshua Tree National Park Joshua trees at sunset, Joshua Tree National Park, southern California, U.S.

Sun

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Written by
Kenneth Lang
Professor of astrophysics and radio astronomy, Tufts University. Prof. Lang is a world renowned author of popular and scholarly books in astronomy and astrophysics.
Kenneth Lang,
Harold Zirin
Professor of Astrophysics, Emeritus; Director and Builder, Big Bear Solar Observatory, California Institute of Technology, Pasadena. Author of Astrophysics of the Sun and others.
Harold Zirin•All
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Last Updated: • Article History

News •

Spacecraft will fly through the Sun's atmosphere tomorrow for the first time ever • Dec. 23, 2024, 8:40 AM ET (Earth.com)
Study suggests our sun could unleash a long-overdue catastrophic superflare this century • Dec. 13, 2024, 6:05 AM ET (TechSpot)
Sun May Be Overdue for a 'Superflare,' Study Warns • Dec. 12, 2024, 8:44 AM ET (Newsweek)
Proba-3 launches tomorrow, ready to eclipse the Sun • Dec. 5, 2024, 1:23 AM ET (Astronomy Magazine)
Solar Orbiter captures highest-resolution views of Sun's surface • Nov. 24, 2024, 11:47 PM ET (TechSpot)

Sun, star around which Earth and the other components of the solar system revolve. It is the dominant body of the system, constituting more than 99 percent of its entire mass. The Sun is the source of an enormous amount of energy, a portion of which provides Earth with the light and heat necessary to support life. It is part of the "observable universe," the region of space that humans can actually or theoretically observe with the aid of technology. Unlike the observable universe, the universe is possibly infinite. (List of Brightest Stars as Seen from Earth) The Sun is ...(100 of 10749 words)

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