question:  Which planet was considered the new frontier?
context: Red Witch of Mercury By EMMETT McDOWELL Death was Jaro Moynahan's stock in trade, and every planet had known his touch. 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. "So," said the red-head; "you have come. "No! Mercury is not ready for freedom. The revolution is scheduled to break during the Festival of the Rains. If it does, the Terrestrials here will be massacred. The Mercurians worship him. "Ah," said Jaro Moynahan; "so that's the way it is." One moment the garden was glowing in light, the next the hot black night swooped down on the revelers, pressing against their eyes like dark wool. 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. Only at night did they emerge to work their fields and ply their trades. The Mercurian glanced at the bill, then back at the Earthman. If the girl had been abducted, only Mercurians could have engineered it in the dark; and the Mercurians were a clannish lot. By stretching out his arms he could touch the buildings on either side: buildings with walls four feet thick to keep out the heat of the sun. They were never visible, but to his trained ears there came stealthy, revealing noises: the brush of cloth against the baked earth walls, the sly shuffle of a step. Jaro Moynahan In the East a sullen red glow stained the heavens like the reflection of a fire. The Mercurian dawn was about to break.
output:  Mercury
options:  Mars  Earth  Mercury  Jupiter