Reimar Lüst

1923 - 2020

Reimar Lüst (1923–2020): Architect of European Space Science

Reimar Lüst was a towering figure in 20th-century science, uniquely bridging the gap between theoretical plasma physics and high-level science diplomacy. As a researcher, he visualized the invisible forces of the magnetosphere; as an administrator, he steered the Max Planck Society and the European Space Agency (ESA) through pivotal eras of expansion.

1. Biography: From U-Boat Prisoner to Science Statesman

Reimar Lüst was born on March 25, 1923, in Wuppertal-Barmen, Germany. His path to academia was interrupted by World War II; from 1943 to 1945, he served as a technical officer on the submarine U-528. After the vessel was sunk in the Atlantic, Lüst was captured and spent the remainder of the war in prisoner-of-war camps in England and the United States (Texas and Mississippi). It was in these camps that he began his formal study of mathematics and physics, taught by fellow captive academics.

Upon returning to Germany in 1946, Lüst studied physics at the University of Frankfurt and the University of Göttingen. He earned his doctorate in 1951 under the supervision of the philosopher and physicist Carl Friedrich von Weizsäcker at the Max Planck Institute for Physics.

Career Trajectory:

1950s–1960s: Conducted research at the Max Planck Institute for Physics and Astrophysics under Werner Heisenberg and Ludwig Biermann.
1963–1972: Founded and served as Director of the Max Planck Institute for Extraterrestrial Physics (MPE) in Garching.
1972–1984: Served as President of the Max Planck Society (MPG), navigating the institution through the social upheavals of the 1970s.
1984–1990: Director General of the European Space Agency (ESA).
1989–1999: President of the Alexander von Humboldt Foundation.
Late Career: Instrumental in the founding of Jacobs University Bremen (formerly International University Bremen), serving as its Chairman of the Board of Governors.

Lüst passed away on March 31, 2020, at the age of 97.

2. Major Contributions: Visualizing the Solar Wind

Lüst’s early scientific work focused on plasma physics and the dynamics of the interstellar medium. However, his most significant contributions involved the study of the solar wind and its interaction with comets and the Earth’s magnetosphere.

Cometary Tail Theory: Working with Ludwig Biermann, Lüst helped establish that the gas tails of comets are shaped not just by light pressure, but by a continuous stream of charged particles from the sun (the solar wind).
The "Lüst Clouds" (Ion Cloud Experiments): In the 1960s, Lüst pioneered a method to study the Earth's magnetic and electric fields by launching sounding rockets that released canisters of barium and strontium into the upper atmosphere. When ionized by sunlight, these elements created glowing, colorful "artificial clouds" that followed the magnetic field lines. This allowed researchers to "see" the invisible structures of the magnetosphere for the first time.
Extraterrestrial Physics: By founding the MPE in Garching, Lüst moved German physics beyond ground-based observation, establishing a powerhouse for satellite-borne instrumentation and X-ray astronomy.

3. Notable Publications

Lüst was a prolific author of both technical papers and strategic visions for science policy.

"The solar wind and the orientation of cometary tails" (1961): A seminal paper (with Biermann and Pappert) that provided evidence for the continuous nature of the solar wind.
"Plasma Experiments in Space" (1967): Published in Science, detailing the results of the barium cloud experiments.
"The Properties of Interplanetary Matter" (1962): A foundational review of the space environment before the era of deep-space probes.
"Hydrodynamics of the Interstellar Medium" (1951): His doctoral thesis, which applied fluid dynamics to the vast clouds of gas between stars.

4. Awards & Recognition

Lüst’s dual legacy as a scientist and an organizer earned him the highest honors in Europe:

Officer of the Legion of Honour (France): For his contributions to European integration through ESA.
Grand Cross of the Order of Merit (Germany): With Star and Shoulder Ribbon.
Wilhelm Exner Medal (1987): Awarded for excellence in research and science management.
Adenauer-de Gasperi Prize (2001): For his services to European unification.
Honorary Doctorates: Received from numerous institutions, including the University of Chicago, the University of Padua, and the University of Maryland.
Asteroid 4359 Berlage was renamed 4359 Reimar in his honor.

5. Impact & Legacy

Lüst is remembered as the "Grand Old Man" of German science. His impact is three-fold:

European Space Autonomy: As Director General of ESA, he oversaw the development of the Ariane 5 rocket and the Horizon 2000 program, which launched flagship missions like Rosetta (to a comet) and Cassini-Huygens (to Saturn/Titan). He ensured Europe was a partner, not a subordinate, to NASA.
Modernizing the Max Planck Society: During his presidency, he modernized the MPG’s administrative structure and promoted the "Harnack Principle" (building institutes around world-class individuals) during a period of intense budgetary pressure.
Educational Innovation: His later role in establishing Jacobs University Bremen helped introduce the concept of private, English-language, international higher education to the German landscape.

6. Collaborations

Lüst operated at the center of a network of 20th-century physics giants:

Ludwig Biermann: His primary collaborator on cometary physics; together they are credited with predicting the solar wind before it was directly measured by satellites.
Werner Heisenberg: Lüst worked under Heisenberg at the MPI for Physics, where he learned to apply theoretical quantum and fluid mechanics to astrophysical scales.
Rhea Lüst: His wife was a respected astrophysicist in her own right. They collaborated on several publications concerning the physics of the sun and the interstellar medium, a rare professional partnership for the era.

7. Lesser-Known Facts

The "U-Boat University": Lüst often remarked that his time as a POW was
"the most important time of my life"
because it allowed him to study without the distractions of war or the rigid formalities of the then-traditional German university system.
The "Barium Cloud" Spectacle: In 1969, one of Lüst’s barium experiments created a cloud so bright it was visible to the naked eye across the Western United States, leading to a flood of UFO reports to local police stations.
A Political Balancing Act: In 1972, Lüst was elected President of the Max Planck Society as a "compromise candidate" during a time of student protests and political polarization. He was praised for his "calm, Hanseatic" demeanor that de-escalated tensions between radical students and conservative professors.