Back to Mars! At long last -- after four years of interplanetary study on Earth -- Nelson Parr stepped aboard the Mars-bound space liner that was to carry him to his home planet. By the year 2120, Earth had established a colony on Mars and had explored the land -- originally inhabitated by Martians, a weird yet intelligent people...
Original title: Secret of the Martian Moons
Genre: Fiction→ Children & Young Adult→ Science Fiction→ Outer Space