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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
Every star has its own life cycle, ranging from a few million to trillions of years, and its properties change as it ages Birth Stars form in large clouds of gas and dust called molecular clouds Molecular clouds range from 1,000 to 10 million times the mass of the Sun and can span as much as hundreds of light-years
- What is a Star? (article) | Stars | Khan Academy
A star is a huge glowing ball of hot gas, mainly hydrogen and helium The temperature is so high in its core that nuclear fusion occurs, producing energy The outward pressure of gas heated by fusion is balanced by the inward pull of gravity, leaving the star in hydrostatic equilibrium This balance of forces lasts for most of a star’s life, maintaining its steady temperature Radiation and
- What is a star? | Space
It's easy enough to say what a star is: one of those bright pointy things that twinkle in the night sky But the actual definition of a star is as rich and colorful as the stars themselves
- 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
- Stars and Their Properties - How Stars Work | HowStuffWorks
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 different times during the year Some stars are alone in the sky, others have companions (binary stars) and some are part of large clusters containing thousands to millions of stars Not all stars are the same
- Star | Encyclopedia. com
Star A star is a hot, roughly spherical ball of gas that shines as a result of nuclear fusion reactions in its core Stars are one of the fundamental objects in the universe Stars—and indeed the entire universe—are made mostly of hydrogen, the simplest and lightest element
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