Weight
Weightlessness is an apparent condition experienced by astronauts or satellites in orbit around a planet. In reality their weight (gravitational pull) is the force that keeps them in orbit. Objects in orbit travel with very high speed. For satellites orbiting 300 - 500 kilometres above the Earth this speed is about 27,000 kph. Without the gravitational pull of the Earth they would fly off in a straight line. The gravitational pull keeps them falling towards the planet. The combination of high sideways velocity and constant pull toward the centre of the Earth bends their path so they stay in orbit.