The City and the Stars and the Sands of Mars

The City and the Stars: The 10-billion-year-old metropolis of Diaspar is humanity's last home. Alone among immortals, the only man born in 10 million years desperately wants to find what lies beyond the city. The Sands Of Mars: Science fiction writer Martin Gibson finally gets a chance to visit the research colony on the Red planet. Its a dream come true, until he discovers the perils of survival on another world.