Stars born in a place in the universe called a Nebula. A nebula is full of star nurseries where stars and planets together are formed (mostly stars alone are formed). Our son was also made in a nebula named Orion. Sun is a yellow dwarf star.
Our sun started its journey as blue dwarf star having surface temperature at approximately 25,000 to 50,000 degree Celsius and our sun as yellow Dwarf Star is 980 times bigger than this blue dwarf star so by this number you can see how small our sun was in its beginning as a Blue dwarf Star . Then it transformed into a white dwarf star as it reduces the fuel consumption. A white dwarf is a star of spectral type 'A' or 'F' having moderate surface temperature approximately 10,000 Kelvin. And now it enters the stage in which it is now a yellow dwarf star. Our sun as a yellow dwarf star is classified as of spectral type G2v star, with G2 standing for the second hottest stars of yellow G class-of surface and 'V' representing a main sequence, or dwarf , star ,the typical star for this class. Yellow dwarf stars has a surface temperature of approximately 5,300-6000 Kelvin and having mass = 0.84 to 1.15 solar masses. Then it will transform into an Orange dwarf star (a star of spectral type 'K') having a surface temperature of approximately 3,900 to 5,200 Kelvin and having mass equal to that of sun or a bit less. An Orange dwarf
Star has more radio activity then a yellow dwarf star. Our sun will then be transformed into a red giant(after 5 billion yes from now ). A red giant is a luminous giant star of low or intermediate mass(roughly 0.3–8 solarmasses( M☉)) in a late phase of stellar evolution. The outer atmosphere is inflated and tenuous, making the radius large and the surface temperature around 5,000 K (4,700 °C; 8,500 °F) or lower. It'll engulf all the inner planets:-
The Mercury, The Venus, The Mars and Our Earth and will reach Jupiter. Finally, it will engulf all the planets in our solar system.
(Image: © Daniel Huber, University of Sydney )
Sizes of red giant stars compared to the Sun. Using the Kepler telescope, we have detected oscillations in hundreds of red giant stars. The periods of those oscillations allowed us to study the interiors of these giant stars, which represent the future life of our Sun.
To be continued. .....
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