The NASA Postdoctoral Program   https://npp.orau.org/ offers early career and senior scientists one- to three-year fellowships with NASA scientists and engineers. Opportunities relate to missions in Earth science, heliophysics, planetary science, astrophysics, space bioscience, aeronautics, engineering, human exploration and space operations, astrobiology, and science management.

Applicants must have completed a doctorate or an equivalent degree before beginning the fellowship, but they may apply while completing degree requirements.