A refrigerator-sized piece of space junk fell harmlessly into the South Pacific Sunday night, according to NASA.

The junk was a tank full of ammonia coolant on the international space station that was no longer needed.

Astronaut Clayton Anderson threw it overboard during a spacewalk in July 2007.

Space station program manager Mike Suffredini said Monday that the debris splashed down somewhere between Australia and New Zealand Sunday night.

The tank had served as a reserve supply of spare coolant at the space station since 2001.

• Click here to read about Anderson tossing it overboard last year.

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