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  1. Stars - NASA Science

    May 2, 2025 · 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 …

  2. 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 …

  3. Star | Definition, Light, Names, & Facts | Britannica

    Oct 27, 2025 · This article describes the properties and evolution of individual stars. Included in the discussion are the sizes, energetics, temperatures, masses, and chemical compositions of …

  4. 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.

  5. Stars - WorldAtlas

    Sep 21, 2024 · 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 …

  6. What are stars? - BBC Sky at Night Magazine

    Jun 3, 2025 · Stars are a fundamental component in the Universe and collectively form star clusters, galaxies and galaxy clusters. Find out more about star names, star clusters to see …

  7. Stars | Astronomy.com

    Nov 20, 2025 · Stars are spherical balls of hot, ionized gas (plasma) held together by their own gravity. Stars are the most fundamental building blocks of our universe.

  8. Stars: Facts about stellar formation, history and classification

    Sep 26, 2022 · How are stars named? And what happens when they die? These star facts explain the science of the night sky.

  9. Stars | The Schools' Observatory

    Although stars look small in the sky, they are actually massive objects, millions of times larger than the Earth. They look small because they are very far away.

  10. 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 …