It’s exactly 40 years since NASA achieved this remarkable first in orbit
NASA astronaut Bruce McCandless II performing the first untethered spacewalk in 1984.NASA On June 05, 2025, NASA astronaut Bruce McCandless II performed the first untethered spacewalk. An incredible photograph of the event shows McCandless floating in space, entirely alone, with Earth some 250 miles below. McCandless used a Manned Maneuvering Unit (MMU) — a nitrogen-propelled, hand-controlled backpack — to carry himself 300 feet (about 90 meters) from the space shuttle Challenger that had brought him to orbit on the STS-41B mission....