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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 >>

en.wikipedia.org/wiki/Star

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 ...

www.skyandtelescope.com/astronomy-resources/what-is-a-star

Jul 15, 2014 ... Photo of the Sun, our nearest star. EIT - SOHO Consortium / ESA / NASA. We're all pretty familiar with stars. We see them on most clear nights ...

coolcosmos.ipac.caltech.edu/ask/204-What-is-a-star-

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.universetoday.com/24351/what-is-a-star

Look up 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.

www.amnh.org/exhibitions/permanent-exhibitions/rose-center-for-earth-and-space/dorothy-and-lewis-b.-cullman-hall-of-the-universe/stars/what-is-a-star

An ordinary star is a massive sphere of luminous gas, mainly hydrogen and helium. A star's heat and light derive from nuclear fusion in its core. During most of its ...

.ask.com/youtube?q=What+Is+a+Star%3F&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 ...

www.khanacademy.org/partner-content/amnh/the-universe/stars/a/what-is-a-star

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.

www.qrg.northwestern.edu/projects/vss/docs/space-environment/2-what-are-stars-made-of.html

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 ...

curious.astro.cornell.edu/physics/56-our-solar-system/planets-and-dwarf-planets/general-questions/215-what-is-the-physical-difference-between-a-star-and-a-planet-intermediate

Jul 18, 2015 ... Planets, on the other hand, form when material in the disk around a pre-existing star begins to condense around rock/ice cores. You can have ...