a satellite (= a device sent up into space to travel around the Earth or another planet, etc.) designed to carry plants or animals, for collecting scientific information about the effects of space on living things

The Sputnik biosatellite carried two dogs, 40 mice, two rats and a variety of plants. Sputnik生物卫星携带了两只狗、40只小鼠、两只大家鼠和多种植物。