Top Ten US EVA Missions of All Time: No. 3—’Repackage Our Margin’

Astronaut Story Musgrave is positioned to replace components at the end of Endeavour’s Remote Manipulator System (RMS) mechanical arm on STS-61 in December 1993. Photo Credit: NASA

More than two decades have passed since one of the most spectacular EVA missions in U.S. history: the long-awaited first servicing of the Hubble Space Telescope (HST). […]

'Vide Mater, Sine Manibus': 30 Years Since Shuttle Mission 51D (Part 2)

Spacewalkers Jeff Hoffman and Dave Griggs work to outfit a makeshift fly swatter onto the Remote Manipulator System (RMS) mechanical arm, in a fruitless attempt to activate Syncom 4-3’s deploy switch. Photo Credit: NASA

Thirty years ago, next week, the crew of Mission 51D watched open-mouthed as a powerful communications satellite which they had […]

'It's Gonna Be Great': 30 Years Since Shuttle Mission 51D (Part 1)

Spacewalkers Jeff Hoffman and Dave Griggs work to outfit a makeshift fly swatter onto the Remote Manipulator System (RMS) mechanical arm, in a fruitless attempt to activate Syncom 4-3’s deploy switch. Photo Credit: NASA

None of the 135 missions flown by NASA’s five-strong fleet of shuttle orbiters between April 1981 and July 2011 could […]

Repair and Salvage: The First 50 Years of Spacewalking (Part 4)

During his historic untethered EVA with the Manned Maneuvering Unit (MMU) on 7 February 1984, Bruce McCandless ventured as far as 300 feet (90 meters) from Challenger. Photo Credit: NASA

Ironically, the spacecraft from which the most Extravehicular Activities (EVAs) were performed—the space shuttle—was not originally intended to carry the capability for spacewalking at […]

The Flight That Wasn't: 30 Years Since the Unflown Mission 51E (Part 2)

In its third incarnation, the mission of Karol “Bo” Bobko finally takes flight on 12 April 1985. Photo Credit: NASA, via Joachim Becker/SpaceFacts.de

Three decades ago, the shuttle program appeared bulletproof. In 1984, astronauts embarked on untethered EVAs, deployed satellites and performed scientific research, retrieved and repaired the crippled Solar Max observatory, and salvaged […]

The Flight That Wasn't: 30 Years Since the Unflown Mission 51E (Part 1)

The “core” NASA crew of Mission 41F, scheduled for launch on 9 August 1984 for a seven-day flight. From left to right are Commander Karol “Bo” Bobko, Pilot Don Williams and Mission Specialists Dave Griggs, Rhea Seddon and Jeff Hoffman. Photo Credit: NASA, via Joachim Becker/SpaceFacts.de

Thirty years ago, this week, the shuttle program […]

Jeff Hoffman, First 1,000-Hour Shuttle Flier, Turns 70 Today

During STS-75, Jeff Hoffman (left) and Franklin Chang-Diaz became the first and second humans to record 1,000 cumulative hours aboard the shuttle. Hoffman hit the record on 29 February 1996, with Chang-Diaz following on 8 March. In total, Hoffman accrued more than 1,211 hours (over 50 days) in space on five shuttle missions. Photo […]

'The Tether Is Broken': The Second Flight of the Tethered Satellite (Part 2)

The Tethered Satellite System (TSS) begins its deployment from the payload bay mast on STS-75. Photo Credit: NASA

Eighteen years ago this week, Space Shuttle Columbia rocketed into orbit carrying one of the most unusual experiments on record: the reflight of the Tethered Satellite System (TSS-1R). Originally conceived by the late Professor Guiseppe Colombo […]

'Rock Solid': The Second Flight of the Tethered Satellite (Part 1)

Columbia thunders into orbit on 22 February 1996, 18 years ago today. Her launch sent hearts leaping into throats within seconds of liftoff. Photo Credit: NASA

Eighteen years ago today (22 February), Space Shuttle Columbia rocketed into orbit carrying one of the most unusual experiments on record: the Tethered Satellite System (TSS). Originally conceived […]

'You and the Rest': Twenty Years Since NASA's Dramatic Hubble Repair Mission (Part 2)

Story Musgrave works at the end of Endeavour’s mechanical arm during activities to service the Hubble Space Telescope. Photo Credit: NASA

Twenty years ago this week, the singular space shuttle mission which marked the demarcation between past and future took place. Since the resumption of flights in September 1988, following the horrific loss of […]