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Stars
Stars are self-luminous, hot bodies that occur in a cloud of dust and gas called nebula. There are notable variations in size, mass and temperature of Stars. The colour of the Stars are determined by its surface temperature. It varies from about 3000 C to over 50000 C. The hottest Stars are seen blue and the coolest are red. The surface temperature of the Sun lies in between these extremes at about 6000ºC and it appears yellow. The energy emitted during the process of nuclear fusion in the Star's care keeps them shining.
The life-cycle of a star
Stars are born in a cloud of dust particles and pas called nebuls. It is formed as a huge ball on condensation of a region of nabulae having higher density. When matured it contracts under its own gravity increasing the surface temperature, and begins to glow. The outer layer gradually expands, cools to a reddish colour and it is the red gant When the fuel begins to run out the outer layer drifts off as glowing gas shells called planetary nebulae. The explosion is called Supernova explosion. The core left behind cools and dims to form a white dwarf. When the shining stops completely it becomes a black dwarf.