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.

May 2, 2025 · 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.

Jul 2, 2025 · 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 …

May 8, 2025 · Stars are more than simply objects in the sky. They teach us about the workings of the universe, from the earliest stars to the current ones. People have long used star charts like this one to find their way around the sky at night.

Jul 15, 2014 · We're all pretty familiar with stars. We see them on 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?

Jan 4, 2021 · It's easy enough to say what a star is. It's one of those bright pointy things that twinkle in the night sky.But beyond that, the actual definition of a star is as rich and colorful as, well, the ...

Apr 11, 2025 · At the lower end, and to the bitter end, defining a star is tougher than you might expect

Sep 23, 2021 · When a medium-sized star (up to about 7 times the mass of the Sun) reaches the red giant phase of its life, the core will have enough heat and pressure to cause helium to fuse into carbon, giving the core a brief reprieve from its collapse.

Mar 20, 2019 · 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 ...

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