The wildest story I have ever read! A giant refrigerator sized tank of Ammonia was thrown from the International Space Station by an astronaut Clayton Anderson during his space-walk! The tank was unneeded..so he disposed it like most of us do..throw it out! ..the only difference being that he was in outer space!! Now NASA is using its complex surveillance systems to track the piece of trash! Although they say it is unlikely to hit anyone but they expect that up to 15 pieces of the tank to survive the searing hot temperatures of re-entry, ranging in size from about 1.4 ounces (40 grams) to nearly 40 pounds (17.5 kilograms). They would hit the earth at about 100mph. The best part is that they don't know as yet where it would fall. It can fall anywhere!! Upgrades to the station last year, made the tank obsolete, and engineers were concerned that its structural integrity would not withstand a ride back to Earth aboard a NASA space shuttle. So..they came up with the best solution possible.. they tossed it overboard, or "jettisoned" it in NASA parlance. I wonder who gave the idea?..I keep hearing from people that majority of the people at NASA are Indians..now it just got confirmed :D. Source: here