Keyword Analysis & Research: stars


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What are stars and stars?

Stars are the most widely recognized astronomical objects, and represent the most fundamental building blocks of galaxies. The age, distribution, and composition of the stars in a galaxy trace the history, dynamics, and evolution of that galaxy.

What is a star summary?

For the article summary, see Star summary. 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.

What is a star made of?

A star is a luminous ball of gas, mostly hydrogen and helium, held together by its own gravity. Nuclear fusion reactions in its core support the star against gravity and produce photons and heat, as well as small amounts of heavier elements. The Sun is the closest star to Earth. Where do stars come from?

What type of star is the Sun in the universe?

It’s a G-type star that formed some 4.6 billion years ago. The Sun is a yellow-white dwarf that will continue its hydrogen-burning phase (that is, “live” on the Main Sequence) for another 5 or so billion years. Then, it will start to fuse helium, which will heat up the Sun and cause it to expand.


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