Zero gravity, often referred to as microgravity, is a condition in which objects appear to be weightless and float freely. This phenomenon occurs when an object is in free fall, such as a spacecraft orbiting the Earth. In this state, the effects of gravity are still present, but they are not felt in the same way as on the surface. Astronauts experience zero gravity during missions aboard the International Space Station (ISS). In this environment, they can conduct experiments and perform tasks without the constraints of weight, allowing for unique scientific research that is not possible on Earth.