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Stars - NASA Science Stars are giant balls of hot gas – mostly hydrogen, with some helium and small amounts of other elements Every star has its own life cycle, ranging from a few million to trillions of years, and its properties change as it ages Stars form in large clouds of gas and dust called molecular clouds
Star - Wikipedia Many other stars are visible to the naked eye at night; their immense distances from Earth make them appear as fixed points of light The most prominent stars have been categorised into constellations and asterisms, and many of the brightest stars have proper names
Star | Definition, Light, Names, Facts | Britannica This article describes the properties and evolution of individual stars Included in the discussion are the sizes, energetics, temperatures, masses, and chemical compositions of stars
Stars—facts and information | National Geographic Stars are huge celestial bodies made mostly of hydrogen and helium that produce light and heat from the churning nuclear forges inside their cores
Stars - WorldAtlas Stars are massive, luminous spheres of gas, mainly composed of hydrogen, with smaller amounts of helium and other elements The lifespan of a star varies widely, generally ranging from several million to several trillion years
The Stars - Center for Planetary Sciences False-color imagery of the Sun, a G-type main-sequence star, the closest to Earth Image courtesy of NASA What are Stars? A star is a massive, luminous sphere of plasma held together by gravity The nearest star to Earth is the Sun, which is the source of most of the energy on the planet
Stars | The Schools Observatory Stars shine for many millions of years, but do not last for ever After forming, they go through several stages which we call the life cycle of a star In astronomy, we measure the brightness of stars in different ways
What is a star? - Cool Cosmos A star is a huge sphere of very hot, glowing gas Stars produce their own light and energy by a process called nuclear fusion Fusion happens when lighter elements are forced to become heavier elements When this happens, a tremendous amount of energy is created causing the star to heat up and shine Stars come in a variety of sizes and colors