Nevertheless, as any device, even spacecrafts have a limited life-cycle. Unlike any other technical tool, which can be disposed and recycled, satellites remain in orbit indefinitely, with no possibility to be controlled. The known object then becomes unknown and dangerous, with the risk to collide with other operative satellites. The high impact velocities (up to 11 km/s) could generate partial damage, or even thousands of dangerous fragments. This could create a ripple effect, called Kessler syndrome, which could prevent future space exploration, as described in the film Gravity (Cuaron, 2013), where spacial debris endangers the crew of the International Space Station.