Giant star

A giant star is a star with substantially larger radius and luminosity than a main sequence star of the same surface temperature. Typically, it will have a radius of between 10 and 100 solar radii and luminosity between 10 and 1,000 times the Sun's. Stars still more luminous than giants are referred to as supergiants and hypergiants. A hot, luminous main sequence star may also be referred to as a giant. Apart from this, because of their large radii and luminosities, giant stars will lie above the main sequence (luminosity class V in the Yerkes spectral classification) on the Hertzsprung-Russell diagram, and will correspond to luminosity classes II or III in the Yerkes classification.
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A red giant is a luminous giant star of low or intermediate mass that is in a later phase of its evolution, with nuclear fusion going on in a shell outside the core but not in the core itself. The core matter is electron degenerate and extremely compressed, so the outer atmosphere is inflated and tenuous, making the radius immense and the surface temperature low, somewhere from 5,000 K and lower. The appearance of the red giant is from yellow orange to red, including the spectral types K and M, but also class S stars and most carbon stars.
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Noun
1. a very bright star of large diameter and low density (relative to the Sun)
(synonym) giant
(hypernym) star
(hyponym) Arcturus

A generic term for a star which possesses a radius greater than ten times that of the Sun. Blue giant stars are members of the main sequence on the Hertzsprung-Russell diagram, whilst red giants are significantly more evolved and are burning helium in their cores.

Eng: giant star
Urdu: ضخّام سِتارہ ۔ کبیلا کی مانِند بہت زیادہ جِسامَت والا سِتارہ ۔ عظیم سِتارہ ۔