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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 The most prominent stars have been categorised into constellations and asterisms, and many of the brightest stars have proper names
Stars - NASA Science Astronomers call stars that are stably undergoing nuclear fusion of hydrogen into helium main sequence star s This is the longest phase of a star’s life The star’s luminosity, size, and temperature will slowly change over millions or billions of years during this phase
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 Many stars occur in pairs, multiple systems, or star clusters The members of such stellar groups are physically related through common
Star Types - Science@NASA When a main sequence star less than eight times the Sun’s mass runs out of hydrogen in its core, it starts to collapse because the energy produced by fusion is the only force fighting gravity’s tendency to pull matter together
What Is a Star? | Types of Stars - Sky Telescope A star’s color relies on its temperature: hotter stars emit bluer light and cooler stars emit redder light Temperature is also correlated to mass
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 For most of its life, a star shines due to thermonuclear fusion in its core releasing energy that traverses the star's interior and then