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1 day ago · 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.
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.
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?
- Where Do Stars Come from?
- Types of Stars
We're all pretty familiar with stars. We see themon most clear nights as tiny, twinkling pinpricks of light in the sky. Stars are the topic of countless poems, stories, and nursery rhymes alike. But just what is a star, exactly? A star is a luminous ball of gas, mostly hydrogen and helium, held together by its own gravity. Nuclear fusion reactions ...
According to current star formation theory, stars are born as clumps within gigantic gas clouds that collapse in on themselves. The cloud’s material heats up as it falls inward under the force of its own gravity. When the gas reaches about 10 million K (18 million °F), hydrogen nuclei begin to fuse into helium nuclei, and the star is born. Energy f...
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. Red dwarf stars have as little as 0.075 solar masses and a visible surface temperature less than 4,000 K. The most massive star known is R136a1, a Wolf-Rayet star 265 times the Sun’s mass — its visible ...
Jan 28, 2022 · 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.
The universe’s stars range in brightness, size, color, and behavior. Some types change into others very quickly, while others stay relatively unchanged over trillions of years.
