Manly Wade Wellman 
Captain Future #21: The Solar Invasion [EPUB ebook] 

Curt Newton and the Futuremen cruise into a strange world peopled with weird, pallid inhabitants, on the quest of a lost satellite which was mysteriously plucked from the sky!
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.