A Journey Too Far Plus Imposter

Two stories. "A Journey Too Far:" An astronaut returns to Earth to find no humans, but a world of Robots and androids at war with each other. "Imposter:" A robotics engineer poses as an android to leave Earth for a terradome on Mars before a huge asteroid hits Earth, because of a feud with the man charged with making the passenger list for the flight. A few androids go to perform hazardous duties.