The International Space Station is often described as being “up” in space, but that word can quietly mislead. The station is not held above Earth by engines firing against gravity. It is not hovering. It is falling. More precisely, it is falling around Earth. Its forward speed is so high that as gravity pulls it [...] The post The International Space Station is not held up by rockets. It is falling constantly, in a precise arc that matches the curvature of Earth — a controlled fall that has cont