NASA says: The ISS is the most heavily shielded spacecraft ever flown. Shielding is designed to protect critical components such as habitable compartments and h

NASA says: The ISS is the most heavily shielded spacecraft ever flown. Shielding is designed to protect critical components such as habitable compartments and high-pressure tanks from the nominal threat of an aluminum sphere approximately 1 cm in diameter. The ISS also has the capability of maneuvering to avoid tracked objects. http://www.nasa.gov/centers/wstf/laboratories/hypervelocity/mmod.html http://www.nasa.gov/centers/wstf/laboratories/hypervelocity/...