- 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
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- 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
- What Is a Star? - Scientific American
I love simple questions that wind up having complicated—or at least not straightforward—answers Astronomers twist themselves into knots, for example, trying to define what a planet is, even
- Stellar classification - Wikipedia
A simple chart for classifying the main star types using Harvard classification In astronomy, stellar classification is the classification of stars based on their spectral characteristics Electromagnetic radiation from the star is analyzed by splitting it with a prism or diffraction grating into a spectrum exhibiting the rainbow of colors interspersed with spectral lines
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- 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
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