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Astronomers have assembled star catalogues that identify the known stars and provide standardized stellar designations.However, most of the stars in the Universe, including all stars outside our galaxy, the Milky Way, are invisible to the naked eye from Earth.The oldest accurately dated star chart was the result of ancient Egyptian astronomy in 1534 BC.Medieval Islamic astronomers gave Arabic names to many stars that are still used today and they invented numerous astronomical instruments that could compute the positions of the stars.By convention, astronomers grouped stars into constellations and used them to track the motions of the planets and the inferred position of the Sun.The Gregorian calendar, currently used nearly everywhere in the world, is a solar calendar based on the angle of the Earth's rotational axis relative to its local star, the Sun.When the stellar core is sufficiently dense, hydrogen becomes steadily converted into helium through nuclear fusion, releasing energy in the process.
Binary and multi-star systems consist of two or more stars that are gravitationally bound and generally move around each other in stable orbits.
Other characteristics of a star, including diameter and temperature, change over its life, while the star's environment affects its rotation and movement.
A plot of the temperature of many stars against their luminosities produces a plot known as a Hertzsprung–Russell diagram (H–R diagram).
Plotting a particular star on that diagram allows the age and evolutionary state of that star to be determined.
A star's life begins with the gravitational collapse of a gaseous nebula of material composed primarily of hydrogen, along with helium and trace amounts of heavier elements.
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William Herschel was the first astronomer to attempt to determine the distribution of stars in the sky.