The SUN

The Sun is the largest object of our Solar System and contains almost 99% of overall mass of Solar System. The Sun is amazing and unique for us but in reality it is an “ordinary” star and there are ‘N’ number of similer kind of stars in our Universe.


The surface of the Sun is called photosphere having temperature around 5,500^o C. There are some areas where temperature is less than 3,500^o C. Therefore, these regions looks darker than other surface areas and known as Sunspots. The region Above the surface of Sun is called Chromoshpere.


Sun generates its energy by nuclear fusion of hydrogen nuclei into helium inside its core, where the temperature exceeds 14 million ^oC and enough to start nuclear fusion. The Sun fuses almost 600 million metric tons of hydrogen per second.


Sun Reference Data

Diameter:	1.4 million km (870,000 miles)
Mass:	330,000 x Mass of Earth
Density:	1.41
Solar Wind Speed:	3 million km/hr
Rotation Period at Equator:	25 Earth days
Solar Cycle:	8 - 11 years
Age:	4.5 billion years, 5 billion years remaining
Distance from Earth:	149.6 million km (93 million miles)
Distance to Nearest Star:	4.3 light years
Luminosity:	390 billion billion megawatts
Temperature at surface:	5,500o C (9,932o F)
Temperature at Core:	14 milliono C (22.5 milliono F)
Temperature of Sunspots:	4,000o C (7,232o F)
Rotation Period at Poles:	35 Earth days

Solar System

Sometimes it seems very surprising and amazing when we talk about the facts of the Universe. Simultaneously we have to accept the truth (no other way to save ourselves).

Since my childwhood I have keen interest towards our SKY and the objects travelling across it without any reason for billions and billions of years. Whatever the Human beings(scientists) are presenting as a theory, actually all those things are already existing and we are just discoverying and redefining it in our own way and frame of reference.

Anyways here we will discuss about our Solar System. There are billions and billions of galaxies in our Universe. There are an estimated 100 billion(10¹¹) galaxies within distance we can see or in the Observable Universe. The number of stars in a galaxy depends upon size of galaxy. Typical galaxies range from as few as ten million (10⁷) stars up to one trillion (10¹²) stars. All the stars usually orbit the center of mass of that perticular galaxy they are associated with.


Galaxies can also contain many nebulas, multiple star systems, star clusters, and various interstellar clouds. The name of Galaxy where our Sun is present is Milky Way(Mandakini: in Hindi) galaxy. There are planets and asteroids rotating arround Sun and as a whole this system is known as Solar System.

References: http://en.wikipedia.org/wiki/Solar_System;http://www.nasa.gov; Images taken from Wikipedia