Edmond Hamilton 
Captain Future #11: Treasure on Thunder Moon [EPUB ebook] 

It’s hell to be told 37 is too old to fly the void when you know where a great treasure lies.
The Captain Future saga follows the super-science pulp hero Curt Newton, along with his companions, The Futuremen: Grag the giant robot, Otho the android, and Simon Wright the living brain in a box. Together, they travel the solar system in series of classic pulp adventures, many of which written by the author of The Legion of Super-Heroes, Edmond Hamilton.