What Is Sky? Can We Touch The Sky? What Is In The Other Side Of The Sky?

The Sky is nothing but a free open space that will accommodate things within! There is no difference between a open space and sky.The blue co loured  sky that we see upon our head is not at all an individual object that we can touch if we go nearer to it! Since the sky is nothing but an open space there is no question of going nearer to it arises and also it goes without saying that nothing is there in the other part of the sky!The sky get it^s blue co lour because of the diffraction of Sun light by the atmospheric air spread over the Earth.Therefore if we travel beyond the Earth^s atmosphere by rockets the sky will appear black only since as I said that the sky is nothing but an open space!