THE STELLER SYSTEM
our earth is cosmic body.it is an insignificant peck of dust in the universe. The universe itself is a vast infinite expanse of space and matter. Mostly it is empty space. In this space matter is only sparsely dispersed in a fashion and due to causes that are as yet beyond our complete understanding. The so called concentration of matter in space have been differentiated by the scientists into nebula, galaxy, stars , planet , asteroids ,comets and cosmic dust and so on . Nebula are enormous masses of gaseous clouds without any structural differentiation . Galaxies are association of billions of stars in each case . All the stars are held together by gravitational force. There are millions of galaxies each with billion of stars in our universe. A single galaxy with its constituent stars makes a STELLER SYSTEM ..
THE SOLAR SYSTEM
A STAR is a huge , massive body of luminescent matter radiating enormous amount of energy every second . Each stars holds around itself, under the influence of force of gravity. A variable number of relatively small size, non radiant bodies of matter , called planets . The basic difference between star and planet is mass. Star is thousand times bigger than planet . So because of such a enormous mass very high temperature are reached in the interior of the stars that make it radiate energy. Our son is also a typical star . It has nine planets or eight planet held and revolving around it under gravitational. The sun and planets are taken together make a solar system. Each Galaxy have billions of solar system. In our system the sun is in the center and planets are revolving around it. It is part of our galaxy as MILKY WAY.
Planet revolving around the sun are in increasing distance order from sun as mercury, venus , earth , Mars , Jupiter, Saturn , Uranus, Neptune...
The mean distance between sun and earth is 149,642,000 km . This is known as one astronomical unit .
Distance from sun in astronomical unit are
Mercury 0.39 AU
Venus. 0.71 AU
Earth. 1.00 AU
Mars. 1.52 AU
Jupiter. 5.20 AU
Saturn. 9.54 AU
Uranus. 19.20 AU
Neptune. 30.10 AU
These planets are revolving around the sun in a circular path is known as orbit . Earth makes orbital motion around the sun at a speed of 29.76 km/s and complete one revolution in 365.25 days or one year. So there are the different time taken by the different planes according to there motion around the sun.
Grouping of planets
On the basis of there distance from the sun and other broad similarities ,
These are divided into two groups.
The inner or terrestrial planets
Four planets are there mercury, Venus, earth , and Mars are in this group..
Relatively small masses
Higher density
Slower speed of rotation
Less number of satellite's
The outer planets
They are the known as superior planets Jupiter, Saturn, Uranus , Neptune.
Very large masses
Much lower density
Faster rotation.and
Higher number of satellite's.....
So there are soo many things which play key role at there u can say fundamental role in the universe . Universe is not small it is beyond the all imagination so there will be more than this ...
To be continued......
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