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Star - Wikipedia A star is a luminous spheroid of plasma held together by self-gravity [1] The nearest star to Earth is the Sun Many other stars are visible to the naked eye at night; their immense distances from Earth make them appear as fixed points of light
Star | Definition, Light, Names, Facts | Britannica A star is any massive self-luminous celestial body of gas that shines by radiation derived from its internal energy sources Of the tens of billions of trillions of stars in the observable universe, only a very small percentage are visible to the naked eye
Stars - NASA Science At the beginning of the end of a star’s life, its core runs out of hydrogen to convert into helium The energy produced by fusion creates pressure inside the star that balances gravity’s tendency to pull matter together, so the core starts to collapse
What is a Star? Types, Life Cycle, and Fascinating Facts This article takes you deep into the heart of stellar science — from the birth of a star in vast clouds of gas and dust, to its dramatic demise as a white dwarf, neutron star, or black hole
What Is a Star and How Does It Work? - ThoughtCo How does a star work? How do they form, live, and eventually die? Learn more about these distant objects and their major importance in the universe
Stars - WorldAtlas As a star approaches the end of its lifespan, it no longer has hydrogen to transform into helium in its core Unable to complete the nuclear fusion process, the star begins to succumb to gravity, slowly collapsing
The Stars - Center for Planetary Sciences A star begins as a collapsing cloud of material composed primarily of hydrogen, along with helium and trace amounts of heavier elements Once the stellar core is sufficiently dense, hydrogen becomes steadily converted into helium through nuclear fusion, releasing energy in the process
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
Astronomers find first direct evidence of “Monster Stars” from the . . . Cambridge, MA (December 9, 2025)— For two decades, astronomers have puzzled over how supermassive black holes, which are some of the brightest objects in the universe, could exist less than a billion years after the Big Bang Normal stars simply couldn't create such massive black holes quickly enough