Space Junk on Hubble Mission

Space shuttle Atlantis is now in a rough orbital neighborhood. It is a place littered with thousands of pieces of space junk going around the Earth at nearly 20,000 mph. There are more pieces of shattered satellites and used up rockets in this region than astronauts have ever met. The crew must be there for more than a week to repair the Hubble Space Telescope. As soon as the job is complete, the shuttle will go back to safety. The telescope orbits about 350 miles above Earth. It is a far dirtier place than where shuttles normally fly. All those tiny junk raise the constant threat of a potentially fatal collision. It's a riskier environment when we go to this altitude. That's what safety chief Bryan O'Connor said. Hubble was too dangerous because flying to the telescope is climbing to a different orbit than the international space station. That means the shuttle cannot use the outpost as a safe harbor in an emergency.NASA now puts the risk for a collision with junk during the mission at 1 in 229. It's greater than flights to the space station but lower than the agency's initial estimates. This is all I could find out and I wonder if the people will suceed in their mission.