 Which planet was considered the new frontier?
But now, on Mercury, he was selling his guns into the weirdest of all his exploits—gambling his life against the soft touch of a woman's lips. [Transcriber's Note: This etext was produced from Planet Stories Summer 1945. The night was very hot; but then it is always hot on Mercury, the newest, the wildest, the hottest of Earth's frontiers. On the hot, teeming planet of Mercury it was as refreshing as a cold plunge. Peet controlled the Latonka trade for which there was a tremendous demand throughout the Universe. For centuries they had lived most their lives beneath ground to escape the terrible rays of the sun. The Mercurian glanced at the bill, then back at the Earthman.
 Mercury
 Mars  Earth  Mercury  Jupiter