In space, because there is no gravity field and atmosphere on the earth, the motion and behavior of objects are very different from those on the earth. On the earth, objects in liquid or gas will be affected by buoyancy, which is the result of the upward supporting force generated by the volume of liquid or gas occupied by the object offsetting the gravity on the object. But in space, without the support of liquid or gas, the motion and behavior of an object will only be controlled by its laws of mass and speed.

In space, objects are not affected by gravity, so there is no phenomenon that objects float or float in water. In a space station or spacecraft, humans can achieve a certain "buoyancy effect" by controlling the flow of air or using devices such as suction cups, but this is not a real buoyancy phenomenon.

In short, there is no buoyancy in space, and the motion and behavior of objects are controlled by the laws of mass and velocity. Humans can achieve a certain "buoyancy effect" through some technical means, but this is not a real buoyancy phenomenon.