The original pilot describes Penny as aged 11, with an I.Q. of 147, and zoology as a hobby. With the arrival of second daughter Penny in 1985, Maureen Robinson left her job at the New Mexico Institute for Space Medicine and became a full-time housewife, a position she found fully satisfying. Like all of John and Maureen's children, Penny Robinson is talented and intelligent. By the time of the Jupiter 2 launch, when she was 11 years old, she had advanced to the 10th grade and had an I.Q. of 147.