WHAT IS THE JUNK SPACE? 
The junk space are objects such as artificial satélites, material discarded from space stations, etc that remain un space after use.
The junk space travels fast enough forma a relatively small piece or orbital debris to damage a satellite or a spacecraft.
The rising population or space debris increases the potential danger to allí space vehicles, but especially to the International Space Station, space  shuttles and other spacecraft with human aboard.
He U.S. Space Surveillance Network, a department that tracks debris floating through space and reports to NASA, observes mover 13,000 man-made objects orbiting Earth larger han 4 inches in diameter.