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Stars 1) A star is a fiery luminous body which emits light of its own. 2) Stars twinkle at night. 3) Stars are countless in number; about 10 22  in a  universe . 4) Stars are very big in size but they appear small because they are very far off. 5) The relative positions of stars do not change day by day. 6) Stars appear to be moving from west to east. 7) The temperature of stars is very high. 8) The sun is the nearest star to the earth. Its light reaches the earth in 8.3 minutes. 9) After sun the next nearest star to earth is Alpha centuri. Its distance is 4.3 light years from earth. 10) The  temperature  of a star is estimated from the colour of its light received on earth. The blue coloured star is at higher temperature than red coloured star. Brightness of a star The brightness of a star is expressed through the system of magnitude. Whereas the observed magnitude of a star is the measure of its brightness when observed from the earth and absolute magnitude o...