How animals became the unsung pioneers of space exploration before humans

Long before humans ventured into space, animals led the way. These early missions tested whether life could survive beyond Earth's atmosphere. Their journeys provided vital clues for human spaceflight.

The first living creatures to cross the atmospheric boundary were fruit flies. In 1947, the US launched them into space aboard a V2 rocket, and they returned alive. This experiment marked the beginning of animal space travel.

A decade later, in 1957, the Soviet Union sent Laika, a dog, into orbit aboard Sputnik 2. She became the first living being to circle Earth but died from overheating during the mission. Her flight proved that a living organism could endure space conditions, even if only briefly.

In 1960, two more dogs, Belka and Strelka, completed a day-long orbital flight and returned safely. Their survival showed that humans could also withstand space travel. The following year, Ham, a chimpanzee, demonstrated that humans could operate a spacecraft in zero gravity. His successful mission paved the way for the first American astronauts.

France entered the race in 1963 by sending Félicette, a cat, into space. Electrodes implanted in her brain monitored neurological activity during the 15-minute flight. She landed safely, providing data on how space affected brain function.

Meanwhile, the Soviets continued testing with less conventional species. In 1968, two steppe turtles became the first live organisms to fly around the Moon and return to Earth. Their mission, aboard Zond 5, proved that complex lifeforms could survive deep-space travel.

Other experiments followed. In 1973, Anita, a spider, wove a fully formed web in microgravity aboard Skylab. Scientists observed how weightlessness affected her behaviour. Fish, sent into space later, initially lost their sense of orientation but eventually adapted. Tadpoles and frog eggs, exposed to microgravity, developed differently than they would on Earth.

By the 1980s, over 30 species—including mice, frogs, newts, and insects—had been launched into space. Each mission added to the understanding of how life responds to the challenges of space.

These animal pioneers played a crucial role in space exploration. Their missions provided data that made human spaceflight possible. Without them, the journey beyond Earth would have remained far more uncertain.