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NASA'S MISSION VOYAGER

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THE MISSION VOYAGER    This mission   was started on 20 August  1977. In this mission NASA launched  a spacecraft named voyager.  This spacecraft was about 6000 billion kilometers away from Earth. Voyager 1 This spacecraft was made to concentrate research to planet Saturn. It was the first man made spacecraft who leaved the solar system. It had acquired about 60 frames. In 1990 14 February spacecraft took last photograph of earth at the request of some scientists and Carl Sagan author of book THE PALE BLUE DOT . In this photograph earth seems to be pale blue and very small compared to vast universe. This why the author Carl Sagan took the phrase " THE PALE BLUE DOT " which is about significance of the photograph taken about 6000 billion kilometers away from earth or 4000 billion miles away from earth. In this photograph,size of earth is smaller than 1 pixel.The coincidence of this photograph is that earth is lying in middle of rightest part of scattered light. Also these sca
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Causes of Lightning Bolts

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Firstly we should have to understand that many tiny ice crystals are present inside the cloud. These tiny ice crystals collide with each other and transfer of electrons take place from some of ice crystals to some other ice crystals and hence net charge imbalance forms on ice crystals having roughly equal and opposite charges. The negatively charged ice crystals accumulate at bottom of cloud and positively charged ice crystals  accumulate at top of cloud .  Due to  accumulation of negative charges on bottom of cloud , the ground get charged by induction and positive charges appear on its surface. When electron get sufficiently accumulated at bottom of cloud they gets flow tow ground and this phenomenon is called Lightning Bolt.    Also the Lightning Bolts concentrate at paths where it can easily flow easily so it always flow through objects like tree, tents, mountain, hills and e.t.c. Some time positive charges from ground also flow towards cloud and then BOLTS is due to positive charg
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