A space pen is a type of pen designed to write in challenging environments, such as in zero gravity, extreme temperatures, or on surfaces like wet or oily paper. The pen uses a special ink cartridge that is pressurized, allowing it to write smoothly in conditions where traditional pens would fail. Originally developed for use by astronauts in space, the space pen can write upside down, underwater, or in very cold or hot conditions. These pens are durable, reliable, and often used by people working in difficult conditions, as well as by outdoor enthusiasts and travelers.

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