sunspot

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Introduction References & Edit History Related Topics

Images & Videos

Study the zoomed-in view of a large sunspot group taken by the Helioseismic and Magnetic Imager, March 29, 2010

Galileo Galilei: sunspots

active region of the Sun

photosphere of the Sun

average yearly sunspot numbers

sunspot drawings

Diagram of sunspot observations made by Johannes Hevelius, 1647.

Observe a close-up of a rotating sunspot

Read Next

Galaxy clusters like Abell 2744 can act as a natural cosmic lens, magnifying light from more distant, background objects through gravity. NASA's James Webb Space Telescope may be able to detect light from the first stars in the universe if they are gravitationally lensed by such clusters. (astronomy, space exploration, galaxies)

How Fast Is the Universe Expanding?

Infinite space background with silhouette of telescope. This image elements furnished by NASA.

Telescopes: Seeing Stars

Planet Jupiter with its moon Io at left, photographed by the Cassini orbiter during the Cassini-Huygens mission, 2000. spacecraft

7 Important Dates in Jupiter History

Discover

The Great Depression Unemployed men queued outside a soup kitchen opened in Chicago by Al Capone The storefront sign reads 'Free Soup

5 of the World’s Most Devastating Financial Crises

General Pershing's troops moving into Mexico in 1917 during World War I.

Timeline of World War I

Berlin, 1936 - Jesse Owens of the USA in action in the mens 200m at the Summer Olympic Games. Owens won a total of four gold medals.

Was Jesse Owens Snubbed by Adolf Hitler at the Berlin Olympics?

British troops in a trench on the Western front during World War I. One officer takes reports of the fighting over a field telephone while the officer on the left jots it down and issues new orders.

Life in the Trenches: A World War I Photo Gallery

Los Angeles Police Department wanted flyer on Elizabeth Short, aka the "Black Dahlia," who was brutally murdered in January 1947. The FBI supported the Los Angeles Police Department in the case, including by identifying Short through her fingerprints that

America’s 5 Most Notorious Cold Cases (Including One You May Have Thought Was Already Solved)

pyramid sunset, egypt

What’s Inside the Great Pyramid?

number zero, 0 balloon

Is Zero an Even or an Odd Number?

sunspot: Related Content

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Photos and Videos

Galileo Galilei: sunspots

active region of the Sun

photosphere of the Sun

average yearly sunspot numbers

sunspot drawings

Diagram of sunspot observations made by Johannes Hevelius, 1647.

Study the zoomed-in view of a large sunspot group taken by the Helioseismic and Magnetic Imager, March 29, 2010

Observe a close-up of a rotating sunspot

Study the magnetic fields in a sunspot pair as observed by the Helioseismic Magnetic Imager, March 29, 2010

See All Videos and Images →

Topics

Wolf’s sunspot number sunspot cycle Evershed effect sunspot maximum butterfly diagram photosphere solar activity solar cycle solar flare solar prominence facula limb darkening Fraunhofer lines

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Key People

Galileo

Galileo

Italian philosopher, astronomer and mathematician

George Ellery Hale

American astronomer

Maria Mitchell

Maria Mitchell

American astronomer

Lockyer

Sir Joseph Norman Lockyer

British astronomer

Richard Christopher Carrington

British astronomer

Seth Barnes Nicholson

American astronomer

Johannes Fabricius

Dutch astronomer

Quiz

View of the Andromeda Galaxy (Messier 31, M31).

Astronomy and Space Quiz

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

The orbits of the planets and other elements of the solar system, including asteroids, Kuiper belt, Oort cloud, comet

Space Odyssey