Read the resource about the International Space Station (ISS). The space station orbits Earth about 400 km above the surface of Earth (NASA.gov). At this height the force of gravity from Earth is only about 10% less than on the surface of Earth. Using the concepts of circular motion and gravitational forces. Explain the following in your own words: Just need 125 words Why does the space station not fall down? Why do the astronauts float inside the space station?