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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
Stars—facts and information | National Geographic Stars spend 90 percent of their lives in their main sequence phase Now around 4 6 billion years old, Earth’s sun is considered an average-size yellow dwarf star, and astronomers predict it will