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A star is a luminous sphere of plasma held together by its own gravity. The nearest star to Earth is the Sun. Many other stars are visible to the naked eye from ...

What is a star? - Sky & Telescope


Jul 15, 2014 ... 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 ...

What is a star? | Cool Cosmos


A star is a huge sphere of very hot, glowing gas. Stars produce their own light and energy by a process called nuclear fusion. Fusion happens when lighter ...

www.ask.com/youtube?q=What Is a Star?&v=32WyKgdBQgE
Nov 27, 2012 ... Science expert Emerald Robinson explains what a star is and the different parts of its life cycle.To view over 15000 other how-to, DIY, and ...

What is a Star? - Universe Today


Jan 29, 2009 ... ... in the night sky and you'll see lots of stars. But what is a star? In a scientific sense, a star is ball of hydrogen and helium with enough mass th.

NASA - A Star Is a Big Ball of Gas


Apr 2, 2008 ... Twinkle, twinkle, little star. How I wonder what you are. What is a star? A star is a big ball of gas. It is not star-shaped. Stars give off heat and ...

What is a Star? | Stars | The Universe | American Museum of Natural ...


Pleiades open star cluster. Credit: NASA, ESA, AURA/Caltech, Palomar ObservatoryA star is a huge glowing ball of hot gas, mainly hydrogen and helium.

Top 10 cool things about stars | Science Wire | EarthSky


4 days ago ... Every star you see in the night sky is bigger and brighter than our sun. .... So technically, the sun is a dwarf star, sometimes called “Yellow ...

What is a Star? - Observatorio ARVAL


The basic difference between a star and a planet is that a star emits light produced in its interior by nuclear 'burning', whereas a planet only shines by reflected ...

What are stars made of?


Our nearest star, the Sun, is so hot that the huge amount of hydrogen is undergoing a constant star-wide nuclear reaction, like in a hydrogen bomb. Even though ...

Stars form when dense portions of interstellar medium condense due to gravity.
The collapsing cloud of dust and gas forms a large, hot core that develops into a main sequence star. As these stars decay, they expand, and their later fate depends on the star's original mass. More >>