A long, long time ago (a little over 40 years ago), the world was introduced to Jedi knights, lightsabers, droids, Wookies and the Force. "Star Wars" exploded into movie theaters in 1977 and became an instant hit, eventually spawning a pop-culture empire, including sequels, prequels, books, comics, video games, television series and radio shows.
And before long, elements of the space fantasy began influencing the development of real-life space technology.
Here's a brief overview of the franchise and its effect on space technology.
The "Star Wars" franchise is divided into three sets of films — the originals, the prequels and the sequels — as well as myriad off-canon television series, video games, radio shows and other forms of media.
The tale, from "a galaxy far, far away," concerns the adventures of young Luke Skywalker, the nephew of a moisture farmer who lives on a desert planet called Tatooine. Luke learns that he is adept at harnessing the Force, described as an "energy field … that binds the galaxy together."
He eventually joins the rebellion against the Galactic Empire, along with his newfound allies — two robots ("droids"), C-3PO and R2-D2; Obi-Wan Kenobi, a Jedi knight in seclusion; a smuggler, Han Solo, and his Wookie co-pilot, a large sentient beast named Chewbacca; and a princess and rebel leader, Leia Organa. Luke also encounters Darth Vader, a Jedi knight who has fallen to the dark side, and (spoiler alert!) turns out to be Luke's father.
With the help of his allies and others in the rebellion, Luke destroys the Death Star, a planet-killing satellite, as well as its bigger, more powerful replacement. In a final showdown, Luke confronts the Emperor and battles Darth Vader, who redeems himself by turning against the Emperor and aiding his son.
The original trilogy — later subtitled "A New Hope," "The Empire Strikes Back" and "Return of the Jedi" — was released into theaters between 1977 and 1983. Director George Lucas expressed frustration with the technology of the 1970s and 1980s, and when digital technology came along in the 1990s, he chose to re-edit the originals and in some cases, alter or add scenes. (The most infamous scene came in the first movie. The original version of "A New Hope" has Han Solo shooting the bounty hunter Greedo, while the re-mastered version has Greedo firing first.)
Lucas also released three prequels between 1999 and 2005 — "The Phantom Menace," "Attack of the Clones" and "Revenge of the Sith" — to chart the path of Darth Vader's rise and fall, and the birth of Luke and (another spoiler alert!) his twin sister, Leia.
In 2012, Disney announced that it would take over the franchise's production and subsequently released a set of sequel films between 2015 and 2019: "The Force Awakens," "The Last Jedi" and "The Rise of Skywalker." The films follow the story of a scavenger named Rey, as she trains to use the Force under the guidance of an aged and reluctant Luke Skywalker, then defeats Emperor Palpatine, helping the Resistance to end the evil reign of the First Order.
In 2020, Disney released ""Star Wars: The Mandalorian," the first live-action "Star Wars" television series for their Disney+ streaming service. The show follows a Mandalorian bounty hunter as he rescues a child of the same species as Yoda. The company also has plans to release another series called "Star Wars: Obi-Wan."
Space fantasy meets space fact
As popular culture became entrenched in "Star Wars" references, words, phrases and ideas from the franchise entered the vernacular of science and technology.
In 1983, President Ronald Reagan proposed the Strategic Defense Initiative, which would use ground- and space-based lasers, particle beams, missiles and other weapons to help protect the United States from attack by nuclear missiles. Critics derisively referred to it as "Star Wars."
The defense system would have some parts of it based in space. One idea, according to Encyclopedia Britannica, was a laser system that could shoot down missiles before they reached their target. The proposal also called for surface-to-air missiles placed beside strategically important locations (such as intercontinental ballistic missile silos). The program led to the development of items such as the Extended Range Interceptor, which successfully caught a missile in-flight in testing in 1987. The U.S. Army also had a successful hit-to-kill on a target on the fourth try with a Minuteman missile, in 1984.
The program was eventually abandoned. There were concerns that the program violated the anti-ballistic missile treaty that was part of the Strategic Arms Limitation Talks, according to the Cold War Museum. Then there were budget cuts before any real progress was made. After $30 billion spent, no laser and mirror system was ever used.
In 2007, shuttle Discovery launched Luke Skywalker's lightsaber into space to commemorate the 30th anniversary of the franchise. The ceremonies on the ground surrounding its handover to NASA included appearances by Chewbacca and Imperial stormtroopers.
Close-up images of Saturn's moon Mimas revealed it looks similar to the Death Star, which had a distinctive circle on one side of its sphere shape. In real life, the moons that have these large circles are actually showing off the remnants of a large asteroid that smacked into the surface and left behind an enormous crater.
NASA has also referenced "Star Wars" when talking about Iapetus, another one of Saturn's moons. "The moon Iapetus, like the 'force' in Star Wars, has both a light side and a dark side," the agency wrote in 2015.
"Star Wars" is also referenced frequently when speaking about planets with two suns, similar to Luke's home planet, Tatooine. Most of the planets that orbit two stars are huge gas giants, but a handful of planets similar to Earth have been found as well, such as Kepler 16b, Kepler-34b, Kepler 35b. In 2015, a study from the University of Utah suggested these sorts of planets might be more common than was once thought. Simulations showed it was possible that planetesimals — the precursors to planets — could safely orbit in an oval around two stars without necessarily crashing into each other.
Droids and robots
Today, there is a real-life R2-D2 — at least the 21stt-century equivalent of it — on the International Space Station (ISS). NASA's humanoid Robonaut 2 is sometimes called R2. It is still in testing, but R2 is intended to flip switches and do other simple science experiments and free up time for the astronauts to do more complicated things. In the future, NASA hopes to outfit a version of the robot to do work outside the space station, rather than sending astronauts out on risky spacewalks.
C-3PO's role was to serve as a translator for his human companions. While robots aren't quite at that stage yet, in 2013 a Japanese child-like robot called Kirobo (created by university researchers in association with Toyota) had a chat with ISS commander Koichi Wakata about their journey into space. Kirobo is intended to be an interactive robot for lonely people, whether they are astronauts in space far from home, or isolated seniors who are unable to get out of the house very easily.
In 2006, NASA launched a set of droids to the space station to test synchronized flying in space, and the technology was used by several ISS crews. The droids are intended to be aware of each other and to synchronize their flying so as not to crash into each other, which is technology that could be useful for satellites. In "Star Wars," robots like these were used for lightsaber training.
There are other, less obvious uses of technology from "Star Wars" being used in space:
For example, the Empire's TIE fighter spacecraft appear to have solar panels on their outer hulls, which is a technology that NASA uses for many of its Mars probes (including the Opportunity rover on the surface) as well as the ISS. Solar panels are most useful on spacecraft that are closer to the sun. This means that a mission such as Rosetta — which chased a comet beyond Mars' orbit — had to have extremely large solar panels to catch the sunlight required. Spacecraft operating farther away require nuclear power.
And while lasers are used for combat in "Star Wars," NASA is testing out lasers for high-speed communications between space and the ground. NASA's Lunar Reconnaissance Orbiter probe, for example, tested out a laser system from the moon and received a picture of the Mona Lisa sent from Earth. NASA is discussing doing laser tests from the ISS to increase the flow of communications from the orbiting complex. This would be particularly useful for experiments, which send out quite a large amount of data for investigators back home.
- Read about 8 sci-fi inventions in "Star Wars" and their real-life counterparts, from Live Science.
- Learn more about the Strategic Defense Initiative and its parallels to "Star Wars", from the Cold War Museum.
- Here are even more connections between NASA and Star Wars.
This article was updated on May 3, 2020 by Space.com Reference Editor Kimberly Hickok.