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- Stars are luminous balls of gas, mostly hydrogen and helium, held together by their own gravity12. They are giant balls of hot gas, mostly hydrogen, with some helium and small amounts of other elements1. Nuclear fusion reactions in their core support the star against gravity and produce photons and heat, as well as small amounts of heavier elements2. Astronomers estimate that the universe could contain up to one septillion stars1.Learn more:✕This summary was generated using AI based on multiple online sources. To view the original source information, use the "Learn more" links.Astronomers estimate that the universe could contain up to one septillion stars – that’s a one followed by 24 zeros. Our Milky Way alone contains more than 100 billion, including our most well-studied star, the Sun. Stars are giant balls of hot gas – mostly hydrogen, with some helium and small amounts of other elements.science.nasa.gov/universe/stars/A star is a luminous ball of gas, mostly hydrogen and helium, held together by its own gravity. Nuclear fusion reactions in its core support the star against gravity and produce photons and heat, as well as small amounts of heavier elements. The Sun is the closest star to Earth.skyandtelescope.org/astronomy-resources/what-is …
Stars - NASA Science
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Scientists call a star that is fusing hydrogen to helium in its core a main sequence …
APOD: 2025 January 1 – Al…
A different astronomy and space science related image is featured each day, …
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Stellar Astronomy - Harvard–Smithsonian Center for …
Stellar astronomy studies the life cycle and structure of stars, both as individuals and as populations. By tracking the commonalities and differences that make stars what they are, we understand the appearance and contents of the visible …
Stars: Facts about stellar formation, history and …
Sep 26, 2022 · Stars are giant, luminous spheres of plasma. There are billions of them — including our own sun — in the Milky Way galaxy. And there are billions of galaxies in the universe. So far, we have...
Types of Stars | Stellar Classification, Lifecycle, and …
There are seven main types of stars. In order of decreasing temperature, O, B, A, F, G, K, and M. O and B are uncommon, very hot and bright. M stars are more common, cooler, and dim. The video below presents a helpful overview of the …
Stars—facts and information - National Geographic
Mar 20, 2019 · Stars are huge celestial bodies made mostly of hydrogen and helium that produce light and heat from the churning nuclear forges inside their cores. Aside from our sun, the dots of light we see in...
APOD: 2025 January 1 – Alpha Centauri: The Closest …
2 days ago · A different astronomy and space science related image is featured each day, along with a brief explanation. Astronomy Picture of the Day . ... The bright stars Alpha Centauri A and B form a close binary as they are separated …
Evolution and classification of stars | Britannica
star, Any massive celestial body of gas that shines by radiant energy generated inside it. The Milky Way Galaxy contains hundreds of billions of stars; only a very small fraction are visible to the unaided eye. The closest star to Earth is the Sun.
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