Why Was the Space Shuttle Retired? Cost, Safety, Politics, and the Compromises of the 1970s

The video asks why the spacecraft that made its first flight nine years after Apollo 17's final Moon landing—the one chosen by "the nation that sent humans to the Moon" as the symbol of the next era—disappeared. It cites three direct reasons: cost, safety, and politics. It then takes the position that the root cause lies in the design compromises forced on the program by the political circumstances of the 1970s.

The Space Shuttle was a crewed spacecraft operated by NASA from 1981 to 2011. The video explains that, as in Japanese words like "shuttle run" and "shuttle bus," the word "shuttle" carries the meaning of traveling back and forth between the same places repeatedly. The Space Shuttle's development began with the goal of making repeated round trips between the ground and space.

The vehicle was divided into three main parts. The first was the winged orbiter, which carried the crew. The second was the pair of solid rocket boosters, which provided most of the thrust at launch. The third was the orange external tank, which supplied liquid propellant to the orbiter's RS-25 rocket engines.

At launch, the two solid rocket boosters and the orbiter's three engines ignited. After about two minutes, the boosters separated, while the orbiter's engines kept burning for roughly another six and a half minutes. The empty external tank was then jettisoned, and the orbiter performed orbital adjustments before entering Earth orbit. At the end of a mission, the orbiter glided down to a runway like a glider.

As for its accomplishments, the video notes that the shuttle not only carried the Hubble Space Telescope into space but, when a flaw was discovered in its optics, also carried astronauts to orbit to repair it, and that it transported the International Space Station's massive modules over many separate flights. Even so, the shuttle was retired in 2011.

The first reason is cost. In the early 1970s, NASA told Congress that the Space Shuttle could fly around 50 times a year at a launch cost of $15 million per flight. As the primary launch system replacing conventional expendable rockets, it would consolidate a wide range of military, commercial, and scientific launches. That was the ideal NASA envisioned at the time.

In reality, though, returning shuttles required extensive repairs and maintenance. The roughly 24,000 heat-resistant tiles covering the orbiter each had a different shape, and damaged ones had to be replaced by hand. The orbiter's engines were removed and disassembled for inspection. The solid rocket boosters, the first components to separate, were dropped into the ocean, so they were recovered after being submerged in seawater and had to be completely disassembled, cleaned, and reassembled. The external tank largely burned up on reentry, making it entirely expendable.

As a result, the number of flights fell far short of the plan. The most flights in a single year was nine, in 1985, and the 30-year average was only around four to five per year—just a small fraction of the original plan of around 50 a year. With so few flights, the cost per flight ballooned. According to one estimate cited in the video, the average cost per launch during the periods between 1982 and 2010 when the shuttle was actually operating was $1.2 billion, rising to $1.5 billion when periods of grounding due to accidents and other causes are included. The video remarks that, given how little commercial use of space there was at the time, the plan was probably unrealistic from the start.

The second reason is safety. The Space Shuttle program suffered two major accidents: Challenger in 1986 and Columbia in 2003.

The direct cause of the Challenger accident was that the O-rings sealing the joints of the solid rocket boosters hardened in the cold, impairing their ability to seal. It later came to light that engineers at the rocket manufacturer, concerned about this problem, had opposed the launch, yet NASA pushed ahead anyway. Challenger exploded 73 seconds after liftoff, killing all seven crew members.

In the case of Columbia, insulating foam broke off the fuel tank during launch and struck the orbiter, damaging the RCC panels that served as the orbiter's heat shielding. As a result, the orbiter broke apart during its return to Earth, and all seven crew members lost their lives. The accident investigation board concluded that although foam shedding occurred on nearly every flight, NASA management had left it unaddressed, treating it as an acceptable risk.

During both accident investigations, the shuttle was grounded. The video points out that this was not something that technical fixes alone could solve; rather, it exposed how NASA's internal organizational culture was out of step with the realities of spaceflight.

What the video calls the "decisive reason" is a political decision. In January 2004, then-President Bush announced the Vision for Space Exploration. The policy was to retire the Space Shuttle upon completion of the International Space Station and redirect resources toward crewed missions to the Moon and Mars. At that point, the video explains, the shuttle accounted for about a quarter of NASA's budget, and the agency could not take on new programs without retiring it.

So how did things come to this? Here the video takes up the gap between the original concept of a "round-trip spacecraft" and the actual vehicle. Of its three components, the boosters were dropped into the ocean and the fuel tank burned up. A little thought reveals how far this strayed from the concept. The video then notes that the root cause of everything, including this problem, is said to lie in the political circumstances of the 1970s, before the shuttle was born.

At the time, several years had passed since Apollo 11's Moon landing, and the United States had already lost its reason to pursue space development as a matter of national prestige. On top of that, the Vietnam War dragged on, and the country's finances were rapidly deteriorating.

What NASA had originally envisioned was a fully reusable two-stage spacecraft. Both stages would have rocket engines and wings, and both would return to a runway after launch. With no expendable components and only minimal maintenance needed before heading back to space, it would be capable of flying at high frequency. This was the concept for making spaceflight cheap and routine.

However, with war spending straining finances and public interest in space waning, the government drastically cut the shuttle's development budget. A fully reusable spacecraft could not be built within that budget. NASA was forced to choose between "building nothing" and "compromising to build within the budget," and it chose the latter. The result was the actual Space Shuttle, which the video describes as NASA's choice to accept high operating costs in exchange for lower development costs.

The video traces how these compromises led to specific problems. For the first stage, instead of reusable liquid-fueled rockets, NASA adopted solid-fueled rockets, which cannot be stopped once ignited until they burn out. But the solid rocket boosters were so enormous that they could not be transported from the factory to the launch site in one piece, so they were built in segments with joints. Those joints caused the Challenger accident.

The video states that the shedding of foam insulation from the external tank, which caused the Columbia accident, was also implemented differently from the original plan.

Furthermore, the heat-resistant tiles needed maintenance after every launch, which lowered the launch frequency, which in turn raised the cost per flight and put even more strain on the workforce. In the video's view, the Space Shuttle program had fallen into this kind of vicious cycle.

The video concludes that the compromises forced on the original design were undoubtedly the root cause of the shuttle's retirement. It then quotes a line from the report on the Challenger disaster: "For a successful technology, reality must take precedence over public relations, for nature cannot be fooled." The video adds, however, that the economic side of things—the budget—is also a reality.

After the program ended, the four remaining orbiters went on display on the ground. Meanwhile, the video notes that parts of the shuttle are still flying in space. The RS-25, once the orbiter's engine, is used on the rocket for the Artemis program, which aims to return to the Moon in the 21st century. On April 2, 2026, Japan time, Artemis II's SLS rocket launched toward the Moon carrying four astronauts, and three of its four RS-25 engines had reportedly once flown on the Space Shuttle.

The video closes by saying that although the Space Shuttle was retired without fulfilling its original promises, its engines still seem to be giving people hope today.