Animals have been central to space exploration from the beginning. The welfare and ethics of animal use in space research presents unique considerations.
Animals used in space research face unique welfare challenges with no analogue in ground-based research. Spacecraft launch subjects animals to intense vibration and acceleration forces. Microgravity environments cause physiological disruption including fluid shifts, vestibular confusion, and long-term bone and muscle changes. Return to gravity is itself a significant physiological stressor. Early space programs treated animal welfare as a secondary consideration to mission success - Laika was sent on a mission with no return plan from the beginning. Modern space research applies 3Rs principles but the unique nature of the research environment creates challenges for minimizing animal suffering that ground-based alternatives cannot yet address. The welfare of space research animals requires the same ethical scrutiny as any other research use.