A felt-tip pen used by astronaut Buzz Aldrin to repair a critical circuit breaker during the Apollo 11 mission has sold for $857,600 at a Sotheby's auction. The seemingly unremarkable pen was instrumental in enabling a safe return to Earth for the lunar module. Aldrin used the pen to depress a reset switch after another tool broke, averting a potential disaster. The auction highlights the vital, yet often overlooked, role of everyday objects in complex space missions. It represents a key moment of ingenuity and quick thinking under pressure during humanity’s first lunar landing. This sale underscores the continuing public fascination with space exploration and its historical artifacts. The pen exemplifies how even simple tools can become invaluable in extreme circumstances.