 Why did Peter choose to go on the mission by himself rather than taking Lorelei with him?
I did not even wish that Peter were not dead, for reason had told me that he had to die. Out there, away from the muffling, distorting, damnable blanket of atmosphere, away from Earth's inexorable gravitational pull, would be a laboratory such as man had never seen. "I have no fear that the people of Earth will fail to meet this challenge, for there is no alternative. It was only two stories down the moving ramp to Lorelei Cooper's laboratory. Peter took it in fifteen seconds, running, and stumbled to a halt in front of the door marked "Radiation." It was a street scene in the Science City of Manhattan, flooded by the warm spring sunshine.
 There was a slim chance of survial
 Women needed to stay underground for reproduction purposes  There was only room for one passenger in the ship.  There was a slim chance of survial  Lorelei was too afraid to make the journey with him.