A simple felt-tip pen that helped rescue two astronauts stranded on the Moon has been sold at auction for $857,600.During the historic Apollo 11 mission in July 1969, Buzz Aldrin used simple writing tools to fix a broken circuit breaker, allowing the lunar module to leave the Moon and return safely to Earth. The brushed aluminum Duro Rocket Pen was the highlight of Sotheby’s 2026 Space Exploration auction, where it sold within the expected price range of $800,000 to $1.2 million.This pen was sold directly from the Buzz Aldrin Family Trust and remains one of the most famous examples of emergency problem-solving in space history.
broken switch on the moon
Penn’s story began after a dangerous problem occurred inside the Lunar Module Eagle. After Neil Armstrong and Buzz Aldrin completed their historic moonwalk, they returned to the lander to prepare for departure. Then he encountered a serious issue.Inside the small spacecraft, an astronaut accidentally broke the plastic tip of the engine arm circuit breaker switch. This switch was extremely important because it activated the ascent engine, the only engine that could lift Eagle’s upper section off the lunar surface.The engine could not be started without the switch. This meant that Armstrong and Aldrin could be left permanently on the Moon, while command module pilot Michael Collins remained orbiting Columbia alone, unable to help them return.
This pen is a brushed aluminum Duro “Rocket” black felt-tip pen that measures approximately 5.5 inches in length.
A simple solution in space
With time running out, Aldrin searched for a way to solve the problem. He noticed that the broken switch had left a small hole where the plastic part had been. If he can insert something small, he can press the internal metal contact and activate the circuit.Any metal object such as a screwdriver or key can cause a short circuit and damage the spacecraft’s electrical system.Then Aldrin remembered his Duro Rocket Pen. The black plastic tip of the pen does not conduct electricity, making it safe to use. He placed the tip in the hole of the broken circuit breaker and pushed it down. The switch returned to its position and the system was successfully activated.The repair worked. On July 21, 1969, the ascent engine started as planned, allowing Eagle to fly by the Moon and meet Collins in lunar orbit.
The little device that became a historical artifact
The pen is approximately 5.5 inches long and is a standard brushed aluminum writing instrument. Its cap has a pocket clip imprinted with the word “Rocket” and a small Velcro strip that helps astronauts attach it to the walls of the spacecraft in zero gravity.Sotheby’s also sold the pen along with the broken engine arm circuit breaker switch button that caused the emergency. Both items came with Aldrin’s signed letter of authenticity, confirming that they were brought to and used on the Moon.The auction also included other important space artifacts, including Aldrin’s personal Omega Speedmaster watches, Apollo mission instruments, and rare engineering items from both the American and Soviet space programs.
Apollo 11 legacy
NASA launched the Apollo 11 mission on July 16, 1969, using the powerful Saturn V rocket. The crew spent three days traveling to the Moon before the lunar module landed in Shanti Sagar on July 20.After landing, Armstrong famously said from Earth, “The Eagle has landed.” He later became the first person to walk on the Moon and said, “That’s one small step for man, one giant leap for mankind.”During their two-and-a-half-hour moonwalk, the astronauts collected 21.5 kilograms of lunar rocks, conducted scientific experiments on the surface, and planted a United States flag.After Aldrin’s quick repairs allowed the Eagle to return to orbit, the crew began the journey home. They landed safely in the Pacific Ocean on 24 July 1969. After a 21-day quarantine to protect against possible lunar pollution, the astronauts returned to public life.
Instead of panicking, Aldrin found a solution.
cost of reaching the moon
Prior to the Apollo missions, NASA invested heavily in astronaut preparation, making the program one of the most expensive and demanding space projects in history. The Apollo program cost approximately $25.8 billion between 1960 and 1973, which is estimated at more than $250 billion in today’s money after adjusting for inflation. A large portion of this budget supports astronaut training, spacecraft development, mission planning, and testing.Astronauts went through years of intensive preparation before each mission. He received classroom instruction in spacecraft systems, orbital mechanics, navigation, geology, and engineering. Because the Apollo astronauts were expected to collect lunar rock samples, they trained with professional geologists and studied volcanic landscapes in places such as Arizona, Hawaii, and Iceland, where the terrain resembled parts of the Moon.Physical fitness was another major requirement. Astronauts follow strict exercise programs and undergo regular medical checkups. They also trained in simulators that recreated every phase of the mission, including launch, lunar landing, spacewalk and emergency situations. Water survival practice prepared them for splashdowns in the Pacific Ocean, while plane flights in low-gravity conditions helped them practice working in near-weightlessness.This extensive preparation ensured that the Apollo crews could operate complex spacecraft, respond to unexpected problems, and safely complete humanity’s first mission to the Moon.