My friend’s Dad gave me this book, and this is a real oldie, from 1953. I’ve read Clement before and his special talent was in conjuring up really wicked strange worlds. This one was about Mesklin, a kind of super-fast rotating planet that had 3x earth gravity on the rim and 700x earth gravity in the center. It was formed into a kind of disk. Clement was as about as hard pure science as you could get. The book is like totally technical. No major character development here, and, in fact, no females. The Mesklinites seems to be 15 inch long 2 inch high armored creatures with a fear of falling any distance whatsoever, or of objects suspended above them. Acrophobia carried to new heights - play on words intended. The story is a quest that a band of Mesklinites makes for an earth rocket that crashed near the center of the planet, impossible ro access for weak earth creatures. Clement doesn’t explain how these earthmen got to Mesklin, and no computers here! He shows the Mesklinites pictures of earth with a kind of movie projector. However, Clement’s worlds are always a lot of fun to read about, and he had a major talent in creating them.