* Lack of Atmosphere: Space has no air to breathe, meaning animals need a special suit or vessel to provide oxygen.
* Extreme Temperatures: Space is incredibly cold, with temperatures reaching hundreds of degrees below zero Fahrenheit.
* Radiation: Space is filled with harmful radiation that would quickly damage an animal's cells.
* Pressure: The vacuum of space has no atmospheric pressure, which would cause bodily fluids to boil.
While some hardy creatures like tardigrades (water bears) can survive extreme conditions on Earth, even they wouldn't last long in the harsh environment of space.