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Because we are viewing them through a thick layer of turbulent of moving air in the atmosphere which causes hindrance.
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REFRACTION the rays frm that undergo refracton hence they aper to be twinklng
Stars appear to twinkle in the sky because they are made up of hot gases and they have  their own light whereas planets donot have their own light and are non luminious and we see them through a thick layer of turbulent of moving air in the atmosphere
the main phenomenon is refraction u ddnt mention it..edit it