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Space trash is exactly that- trash left in space. It is sometimes called space junk or, in more formal settings, orbital debris.
According to NASA, more than 27,000 items of debris are being tracked. Additionally, there are around 23,000 items larger than a softball orbiting Earth. Many other pieces are too small to be tracked.
To date, only one person has been hit with space trash. Lottie Williams was hit by a piece in 1997 while walking through the park in Tulsa, Oklahoma.
Point Nemo sits more than 1,000 miles from any civilization and is considered the most remote point in the world. Because of that, many pieces of equipment end up there when they reenter the atmosphere.