Question by Saint ; Because the Universe is fundamentally Three Dimensions ; Length , Breadth and last but least Depth . Hence Physical Objects . Now think about nothing ...... when you do , you realise that nothing is the complete opposite of something . What can nothing produce ? Physically . Something , .....on the other hand produces , everything , in this Universe . All States of Energy and Matter . From Absolute Zero , to the Energy given off by Galaxies , Quasars etc. Always .