Who it’s: Bruce McCandless II, a NASA astronaut, checking out the Manned Maneuvering Unit (MMU) throughout house trip project STS-41-BWhen it was once taken: Feb. 7, 1984Where it’s: Low Earth orbitWhy it is so particular: This week is the fortieth anniversary of the primary untethered spacewalk. On Feb. 7, 1984, NASA astronaut Bruce McCandless II strapped on a hand-controlled backpack and, propelled by way of its nitrogen gasoline thrusters, flew out of the gap trip Challenger payload bay. He were given to about 320 toes (98 meters) from the spacecraft, changing into the primary human to try a spacewalk with out a protection tether. McCandless orbited Earth — as the primary human satellite tv for pc — for 1 hour, 22 mins.The instant was once immortalized by way of Robert “Hoot” Gibson, Challenger’s pilot. He used a Hasselblad digital camera to seize McCandless flying solo top above Earth. The pictures was arguably essentially the most iconic of all of the house trip program.Similar: 15 jaw-dropping spacewalk picturesEvery other view of astronaut Bruce McCandless II on his history-making spacewalk (Symbol credit score: NASA)Even if the pictures have been unplanned, Gibson knew straight away that they’d be iconic, so he took 3 light-meter readings and checked the focal point 4 occasions for every {photograph}, in line with NASA. He even tilted the digital camera to ensure the horizon was once stage within the pictures.”It should were one small step for Neil,” McCandless stated as he orbited Earth solo, “however it is a heck of a giant bounce for me.” (His quip, after all, referenced Neil Armstrong’s well-known line, “That is one small step for a person, one massive bounce for mankind,” when taking the primary human step at the moon 15 years previous.)Fittingly, McCandless served because the voice of NASA’s Undertaking Keep watch over throughout 1969’s Apollo 11 and 1971’s Apollo 14 missions. His 2nd and ultimate spaceflight was once in April 1990 at the STS-31 project to deploy the Hubble House Telescope into Earth’s orbit from the gap trip Discovery shipment bay. He died in 2017, at age 80. His backpack, the MMU, is on show on the Nationwide Air and House Museum’s Steven F. Udvar-Hazy Middle in Chantilly, Virginia. The MMU was once used throughout 3 missions in 1984 ahead of being retired for protection causes.