Arbaaz Ali on Instagram: "In 1984, Astronaut Bruce McCandless II made history by performing the first untethered spacewalk during the STS-41B mission on February 7. He used a nitrogen-propelled jetpack called the Manned Maneuvering Unit (MMU) to travel away from the Space Shuttle Challenger, floating freely above Earth's surface and cementing his place in space history. Key Details about the 1984 Event Date: February 7, 1984. Mission: STS-41B, aboard the Space Shuttle Challenger. Achievement: Th