Tell about space means 15-20 lines on space and earth for G.K.
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Sound waves cannot travel through a vacuum. 'Outer space' begins about 100 km above the Earth, where the shell of air
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2
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The sheer size of space makes it impossible to accurately predict just how many stars we have. ... That number is between 200-400 billion stars and there are estimated to be billions of galaxies so the stars in space really are completely uncountable.
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hope that help u dear .... i think that increases ur gk....as well
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