On February 7th in science history, one significant event occurred in 1984 when NASA astronaut Bruce McCandless II performed the first untethered spacewalk. During the Space Shuttle Challenger mission STS-41-B, McCandless ventured out into the void of space using only a Manned Maneuvering Unit (MMU), becoming the first human to float freely in space without any physical connection to a spacecraft.
The MMU was a nitrogen-propelled backpack that allowed astronauts to maneuver independently in space. It was designed to provide a means for astronauts to perform tasks outside the spacecraft without the need for tethers or umbilicals. The device was controlled by hand-operated joysticks and had a maximum speed of about 3 miles per hour (4.8 km/h).
During his historic spacewalk, McCandless traveled up to 320 feet (98 meters) away from the Challenger orbiter, testing the capabilities of the MMU and demonstrating the feasibility of untethered spacewalks. He described the experience as "a feeling of freedom and control that was truly exhilarating."
This milestone event paved the way for future untethered spacewalks and expanded the possibilities for astronauts to perform maintenance, repairs, and other tasks in space. The iconic photograph of McCandless floating freely against the backdrop of Earth has become one of the most famous images in spaceflight history.
However, the MMU was later retired due to safety concerns and the high cost of maintaining the units. Today, astronauts rely on a simplified version called the Simplified Aid for EVA Rescue (SAFER), which is used only in emergency situations.
Bruce McCandless II's untethered spacewalk on February 7, 1984, remains a testament to human ingenuity and the spirit of exploration that drives us to push the boundaries of what is possible in space.
This content was created in partnership and with the help of Artificial Intelligence AI
