write some notes about celestial body ?
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Some note about celestial body
Comet is also known as a star with tail , although it is not enumerated as star .
The period of revolution of the comet Halley is 76 years . It is , therefore , seen again on the expiry of 76 years .
The estimated number of galaxics in the universe is 1000 arab .
A galaxy consists of nearly 10 " stars .
Our solar system is situated near the outer core of our galaxy .
Our galaxy is spiral in shape and its diameter is 1 , 00 , 000 light years .
The star next to sun in closeness is alpha Centauri which is at a distance of 4 : 3 light years from us .
The astronomical distances are measured in light year and parsec . 1 parsec = 3 : 26 light years .
A star that is one parsec away from the earth has parallux ( apparelt shift ) , due to the earth ' movement around the Sun , of one second of arc .
The diameter of a white dwarf is much less than that of the Sun , but these are more luminescent than the sun.