Tardigrades Can Survive in the Vacuum of Space
These microscopic 'water bears' can survive exposure to space vacuum, extreme temperatures, and radiation levels that would kill almost any other life form.
About this fact
Tardigrades, also known as water bears or moss piglets, are microscopic animals that represent the ultimate survivors. These tiny creatures (0.1-1.5mm) can enter a state called cryptobiosis, essentially suspending all biological processes. In this state, they can survive: the vacuum of space, temperatures from near absolute zero to 150Β°C, radiation levels 1000 times higher than what would kill humans, and complete dehydration for decades. In 2007, European scientists sent tardigrades to space on the outside of a spacecraft for 12 days. When they returned to Earth, many survived and even reproduced normally. They achieve this by producing unique proteins that protect their DNA and by replacing their body water with trehalose sugar. Scientists study tardigrades to understand extreme survival mechanisms and potential applications for space travel.