After seeing the astronauts floating in the spacecraft, many people take it for granted that there is no gravity in space. So, is there really no gravity in space?
actually not. Gravity refers to the force generated by an object being attracted to the earth. We all know that the farther away from the earth, the weaker the gravitational effect will be, but the gravitation will not completely disappear, but the effect will be different. Although people are in a state of weightlessness in space, the gravity of the earth still exists.
In space, the spacecraft is subjected to the combined forces of gravity and centrifugal force. If these two forces are just offset, both the human body and the spacecraft are in a state of weightlessness. Under weightlessness, people will float, just like death. When swimming in the sea, when the buoyancy and gravity of the human body are just offset, people can float on the water. Weight loss is a normal phenomenon.