Sun nasa

Nasa Image

The Sun is a star- a gigantic ball of burning gas. It is the only star of the Solar system and acts as the ultimate source of energy for all the other component bodies of the solar system. It has been shining for about 5 billion years and will continue to do so for another 8 billion years after which it will become a Red giant (As speculated by the astronomers and astrophysicists).


In deserts here on Earth, heat that has travelled 150 million kilometres from the sun can be hot enough to fry an egg. The Sun's surface is super hot at 6000˚C and its transition level is hotter at 1 million˚C and the core is furthermore hot at 14,000,000˚C.


Like all the other stars, the sun is primarily made of Hydrogen and some amounts of Helium. By mass the composition of the sun is 75 percent hydrogen  and 25 percent helium. Various metals make up less than 0.1 percent of the mass of the sun. The following Table shows the composition of various elements inside the Sun.



(percentage of total number of atoms)


(percentage of total mass)


91.2 71.0


8.7 27.1


0.078 0.97


0.043 0.40


0.0088 0.096


0.0045 0.099


0.0038 0.076


0.0035 0.058


0.0030 0.14


0.0015 0.040

The sun weighs at about 1.9 × 10^30 Kg. And its radius is 6.96 × 10^8 metres. There is an interesting fact about the sun that 95% of the known stars are less massive than the Sun. Any object which wants to get free from the pull of gravity of sun should go with an Escape velocity of 618 km/s. 

There are currently two probes working  to study the Sun. SOHO and Ulysses. SOHO has helped map 90% of the Sun's surface and tell us more revealing facts about the Sun.

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