Why Animals Were Sent Into Space
Before human spaceflight, agencies needed to study how launch forces, microgravity, and radiation affect living organisms. Animals helped scientists understand survival in space and test life-support systems. Early results guided spacecraft design and mission safety for astronauts.
Key Species and Missions
Fruit flies were the first animals in space in 1947. Dogs such as Laika orbited Earth in 1957, followed by primates like Ham and Enos in the early 1960s. Later missions carried mice, frogs, and insects to study bone loss, muscle changes, and behavior in microgravity.
Legacy for Human Spaceflight
Data from animal missions improved radiation shielding, cabin environments, and reentry procedures. Many biological findings still inform research on the International Space Station. Learn more about early animal spaceflight history at https://www.nasa.gov/topics/spaceflight/animals-in-space
