Adventures on Other Planets

From the back cover of the Ace first edition: "All aboard for outer space! Already man is taking the first steps into space! The artificial satellite you've read about in the papers is but the first exciting step that will open up a universe of wonders. Here's a new science-fiction anthology that presents some of the astounding ADVENTURES ON OTHER PLANETS that may be awaiting us: A clash with an incredible entity on Venus! Mental wizardry on age-old Mars! Man-hunt in a world of servile killers! Battle of wits with a conqueror from Andromeda! Filled with the exotic color and eerie inhabitants of distant worlds, these great science-fiction novelettes are written by the biggest names in fantasy..."