The National Aeronautics and Space Administration (NASA) Ames Research Center is soliciting information from potential sources for the SpinSat Science initiative, aimed at experimentally measuring the effects of deep-space radiation and reduced gravity on biological and physical systems. The SpinSat spacecraft platform is designed to provide low-cost, reliable access to deep space for a variety of experiments, accommodating payloads in CubeSat form factors and simulating various radiation environments, including those of the Moon and Mars. Interested parties, including researchers and hardware providers, are encouraged to submit their payload concepts and capabilities by December 16, 2024, to ensure that the SpinSat platform meets their experimental needs. For further inquiries, contact Noor Khazendar at noor.khazendar@nasa.gov or the New Opportunities Center at ARC-Sources-Sought@mail.nasa.gov.