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Learn about the origin and meaning of the five-pointed star, a common ideogram in modern culture. Find out how it is used in flags, emblems, coins, and other contexts, such as the yellow star of communism and the European Union.
A pentagram is a regular five-pointed star polygon, with various meanings and uses in different cultures and traditions. Learn about its origins, associations, orientations, and occult significance from ancient times to the present.
Find out which stars are the largest in the Milky Way and beyond, based on their radius and luminosity. Compare different methods and sources of measuring stellar sizes, and learn about the challenges and caveats of determining accurate values.
The Sun's spectral type is G2V, indicating a main-sequence star with a surface temperature around 5,800 K. Learn about the history, methods and systems of classifying stars based on their spectral characteristics.
A star is a luminous sphere of plasma held together by self-gravity. Learn about the origin, evolution, properties and classification of stars, as well as their cultural and scientific significance throughout history.
The main sequence is a band of stars on a color-magnitude diagram that shows their evolutionary stage and physical characteristics. Main-sequence stars are mostly hydrogen-fusing dwarfs, including the Sun, and their mass, composition, and age determine their position on the sequence.
Stars evolve through different phases as they fuse elements and lose mass. The ultimate fate of the outer layer of a star depends on its mass: low-mass stars become white dwarfs, intermediate-mass stars form planetary nebulae, and high-mass stars explode as supernovae.
A hendecagram is a star polygon with 11 vertices and edges. Learn about its regular and irregular forms, construction, applications, and examples in geometry, art, and science.