,
Frank Malina, Ed Forman and
Jack Parsons testing their first liquid-fueled rocket engine. JPL traces its beginnings to 1936 in GALCIT (the
Guggenheim Aeronautical Laboratory at the
California Institute of Technology) when the first set of
United States rocket experiments were carried out in the
Arroyo Seco. This initial venture involved Caltech graduate students
Frank Malina,
Qian Xuesen, Weld Arnold and
Apollo M. O. Smith, along with
Jack Parsons and
Edward S. Forman, often referred to as the "Suicide Squad" due to the dangerous nature of their experiments. Together, they tested a small, alcohol-fueled motor to gather data for Malina's graduate thesis. Malina's thesis advisor was engineer/aerodynamicist
Theodore von Kármán, who eventually secured U.S. Army financial support for this "GALCIT Rocket Project" in 1939.
Rocketry beginnings In the early years of the project, work was primarily focused on the development of rocket technology. In 1941, Malina, Parsons, Forman,
Martin Summerfield, and pilot Homer Bushey demonstrated the first jet-assisted takeoff (
JATO) rockets to the Army. In 1943, von Kármán, Malina, Parsons, and Forman established the
Aerojet Corporation to manufacture JATO rockets. The project took on the name Jet Propulsion Laboratory in November 1943, formally becoming an Army facility operated under contract by the university. In the same year, Qian and two of his colleagues drafted the first document to use the name Jet Propulsion Laboratory. sketching out a plan on the wing of an airplane. From left to right:
Clark B. Millikan,
Martin Summerfield, von Kármán, Frank J. Malina and pilot, Capt. Homer Boushey. In a NASA conference on the history of early rocketry, Malina wrote that the work of the JPL was "considered to include" the research carried out by the GALCIT Rocket Research Group from 1936 on. In 1944, Parsons was expelled due to his "unorthodox and unsafe working methods" following one of several FBI investigations into his involvement with the occult, drugs and sexual promiscuity. During JPL's Army years, the laboratory developed two significant deployed weapon systems, the
MGM-5 Corporal and
MGM-29 Sergeant tactical ballistic missiles, marking the first US ballistic missiles developed at JPL. It also developed several other weapons system prototypes, such as the Loki anti-aircraft missile system, and the forerunner of the
Aerobee sounding rocket. At various times, it carried out rocket testing at the
White Sands Proving Ground,
Edwards Air Force Base, and
Goldstone, California. As a result of this transition, JPL became the agency's primary planetary spacecraft center, leading the design and operation of various lunar and interplanetary missions. The transfer to NASA marked the beginning of a "Golden Age" of planetary exploration for JPL in the 1960s and 1970s. JPL engineers designed and operated
Ranger and
Surveyor missions to the
Moon that paved the way for the
Apollo program. JPL proved itself a leader in
interplanetary exploration with the
Mariner missions to
Venus,
Mars, and
Mercury, returning valuable data about our neighboring planets. In 1961, JPL hired
Dana Ulery as the first female engineer to work alongside male engineers as part of the
Ranger and
Mariner mission tracking teams.
Deep space exploration Building on the momentum from the successes of the 1960s and early 1970s, JPL initiated an era of deep space exploration in the late 1970s and 1980s. The highlight of this period was the launch of the twin
Voyager spacecraft in 1977. Initially set on a trajectory to explore Jupiter and its moon Io,
Voyager 1s mission parameters were adjusted to also provide a close flyby of
Saturn's moon
Titan. The spacecraft sent back detailed images and data from both gas giants, revolutionizing the understanding of these distant worlds. The
Voyager 2 spacecraft followed a more extensive trajectory, conducting flybys of not just Jupiter and Saturn, but also Uranus and Neptune. These encounters provided firsthand data from all four gas giants, offering insights into the nature and dynamics of the outer planets. Both Voyager spacecraft, after fulfilling their primary mission objectives, were directed towards
interstellar space, carrying with them the
Golden Records – phonograph discs containing sounds and images selected to portray the diversity of life on Earth. The 1980s also saw the inception of the
Galileo mission which launched in the late 1980s. The
Galileo spacecraft was designed to study
Jupiter and its major moons in detail. Although the probe only entered the gas giant's orbit in the 1990s, its inception and planning during the 1980s signified JPL's continued commitment to deep space exploration. '' rover drove over this outcrop and cracked it open.
Mars exploration The 1990s and 2000s saw a resurgence in
Mars exploration, driven by JPL's
Mars Pathfinder and
Mars Exploration Rover missions. In 1997, the Mars Pathfinder mission deployed the first successful Mars rover,
Sojourner, demonstrating the feasibility of mobile exploration on the Martian surface. In 2004, the Mars Exploration Rovers,
Spirit and
Opportunity, landed on Mars.
Opportunity outlived its expected lifespan by 14 years, providing a wealth of scientific data and setting the stage for future Mars missions.
Earth science and robotic exploration and
Sojourner rover by the Jet Propulsion Laboratory on May 12, 2008|250x250pxIn the 2000s and 2010s, JPL broadened its exploration scope, including the launch of missions to study the outer planets, like the
Juno mission to Jupiter and the
Cassini-Huygens mission to Saturn. Concurrently, JPL also began to focus on Earth science missions, developing satellite technology to study climate change, weather patterns, and natural phenomena on Earth. JPL also opened the Near-Earth Object Program Office for NASA in 1998, which had found 95% of asteroids a kilometer or more in diameter that cross Earth's orbit by 2013. Entering the 2010s and 2020s, JPL continued its Mars exploration with the
Curiosity rover and the Mars 2020 mission, which included the
Perseverance rover and the
Ingenuity helicopter.
Perseverances core objective is to collect samples for a future Mars Sample Return (MSR) mission. In addition, JPL ventured into asteroid exploration with the
OSIRIS-REx mission which returned a sample from asteroid
Bennu.
2020s and beyond As JPL moves forward, its focus remains on diverse interplanetary and even interstellar missions. Future Mars missions will aim to return the samples collected by the Perseverance rover back to Earth. Additionally, JPL's
Europa Clipper mission launched in 2024 to study Jupiter's moon
Europa, believed to harbor a subsurface ocean. Building on the Voyager program's success, JPL continues to push the boundaries of deep-space exploration. The
Interstellar probe concept, though not yet formalized, proposes to send a spacecraft ten times the distance from the Sun as Pluto, to explore the interstellar medium and the outermost reaches of the
Solar System. JPL has been recognized four times by the
Space Foundation: with the Douglas S. Morrow Public Outreach Award, which is given annually to an individual or organization that has made significant contributions to public awareness of space programs, in 1998; and with the John L. "Jack" Swigert, Jr., Award for Space Exploration on three occasions – in 2009 (as part of NASA's Phoenix Mars Lander Team), 2006 and 2005. In January 2025, JPL was closed and evacuated due to the
Eaton Fire raging in the nearby towns of
Pasadena and
Altadena, with operations like the DSN getting relocated offsite. Although the facility has not sustained damage from the wildfires, it has experienced minor wind damage and as well as numerous employees losing their homes. ==Location==