The machine would be propelled by an arrangement of planes and propellers similar to those used in aeroplanes. The coronium would entirely eliminate the problem of weight, which is the greatest difficulty the aeroplane constructor has to deal with.     Coronium having such tremendous lifting power, it would be necessary to anchor the airship down to the earth with strong cables.     When the start is to be made for the heavenly spaces, the ship’s prow is carefully aimed in the direction of the heavenly body to be visited. Then the ship is released, and away she flies through the heavy lower atmosphere with almost the speed of light. As she reaches the rarefied upper regions the speed diminishes.     At last she clears the atmosphere and the wonders of the whole celestial universe are revealed to the adventurers in the steel car. All the stars and planets appear as halls of light upon a black ground, for where there is no atmosphere there is no diffusion of light. All about them is absolute zero.     The watchers peering through the windows see the surfaces of the heavenly bodies just as if they were a foot away, for distance cannot obscure the vision where there is neither dust nor vapor.     Let us suppose that the travellers are bound for Venus. That will provide a comfortable dwelling place for man when the earth becomes uninhabitable from the cold, as we know it must become in course of time.     Venus has a high temperature, for the density of the atmosphere causes the retention of the heat. It is probably