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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 star, 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 composing the observable universe , only a very small percentage are visible to the naked eye
Stars - NASA Science 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
What Is a Star? | Types of Stars - Sky Telescope 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
Stars and Their Properties - How Stars Work | HowStuffWorks Some stars are relatively close (the closest 30 stars are within 40 parsecs) and others are far, far away Astronomers can measure the distance by using a method called parallax, in which the change in a star's position in the sky is measured at
What Is a Star? | Scientific American In a very broad sense, a star is simply one of those twinkling points of light you can see in the night sky But that’s not terribly satisfying in either lexicological or physical terms
Star - New World Encyclopedia A star is a massive, luminous ball of plasma that is held together by its own gravity The nearest star to Earth is the Sun, which is the source of most of the energy on Earth Other stars are visible in the night sky, when they are not outshone by the Sun
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