Astronauts in a spacecraft orbiting the Earth or out for a space walk (Fig. 7.29) are seen

Question:

Astronauts in a spacecraft orbiting the Earth or out for a €œspace walk€ (Fig. 7.29) are seen to €œ float€ in midair. This phenomenon is sometimes referred to as weightlessness or zero gravity (zero-g). Are these terms correct? Explain why an astronaut appears to float in or near an orbiting spacecraft.