In space, there is no gravity to pull the snow down, so it floats around like tiny ice crystals. These ice crystals can form snowflakes, just like they do on Earth. However, space snowflakes are usually much smaller than snowflakes on Earth, and they don't stick together as well. This is because there is no atmosphere in space to provide the friction that helps snowflakes stick together.

Space snow can be a hazard to astronauts. If it gets into their eyes or mouth, it can cause frostbite. It can also damage their equipment. For this reason, astronauts wear special suits that protect them from the cold and from space snow.