Science on This Day: December 14 | Max Planck, Mariner 2 and Nostradamus
December 14 offers a useful reminder that science develops in different ways. Sometimes a scientist has to rethink the basic rules used to explain the natural world. Sometimes a spacecraft travels millions of kilometres to collect evidence that cannot be gathered from Earth. And sometimes the history of science involves examining what people believed about health and disease before modern medical knowledge was available.
On this date in 1900, physicist Max Planck presented work that helped establish quantum theory. In 1962, NASA’s Mariner 2 spacecraft completed the first successful close-up study of another planet when it flew past Venus. December 14 is also traditionally recorded as the birth date of Michel de Nostredame, better known as Nostradamus, in 1503. Although he is now most famous for his prophecies, he also worked as an apothecary and medical practitioner.
These three events provide opportunities to explore physics, space science, the history of medicine and the way scientific explanations are developed and tested.
Max Planck and the beginnings of quantum physics
On December 14, 1900, German physicist Max Planck presented a theoretical explanation of blackbody radiation to the German Physical Society in Berlin. The date is often associated with the birth of quantum theory because Planck's explanation introduced a radical idea about how energy could be exchanged.
A blackbody is an idealised object that absorbs all the electromagnetic radiation falling on it. When heated, it emits radiation across a range of wavelengths, with the distribution depending on its temperature. Scientists had been studying this radiation, but existing classical physics could not correctly explain the full pattern observed in experiments.
Planck developed a mathematical expression that matched the measurements. To derive it, he proposed that the energy associated with the oscillators in his model could be exchanged in discrete amounts rather than taking any possible value continuously. The energy of each amount was related to the frequency of the radiation through the equation (E = hf), where (E) is energy, (h) is Planck's constant and (f) is frequency.
This was a major departure from the assumptions used in classical physics. However, Planck did not immediately set out to overturn the entire understanding of nature. He was trying to solve a specific problem involving thermal radiation. The wider implications of his work became clearer as other scientists developed the ideas further. Albert Einstein, for example, later used the concept of light quanta to explain the photoelectric effect, while further work by physicists including Niels Bohr, Erwin Schrödinger and Werner Heisenberg helped build quantum mechanics.
Planck received the 1918 Nobel Prize in Physics for his discovery of energy quanta. Quantum theory now helps explain the behaviour of atoms, electrons and light, and underpins technologies ranging from semiconductor electronics to lasers.
A classroom connection: when a successful theory is not enough
Planck's work makes a useful case study in how scientific knowledge changes. Students can begin by considering why scientists need mathematical models, then explore what happens when experimental results do not fit an accepted explanation. The key point is not that classical physics suddenly became useless. It remains extremely effective for describing many everyday situations. Instead, scientists discovered that it did not provide the complete explanation for every physical phenomenon.
Ask students: If a theory makes accurate predictions in many situations, what kind of evidence might convince scientists that it needs to change? They could discuss the difference between discarding a theory completely and developing a more comprehensive model that includes the situations where the older theory works.
For a follow-up activity, students can investigate how quantum ideas connect to modern technology. My free neutron stars research project template offers another route into extreme physics, while the plasma physics article and research project connects physics concepts to phenomena such as auroras and fusion research.
Mariner 2 reaches Venus
On December 14, 1962, NASA's Mariner 2 spacecraft passed Venus at a distance of about 34,800 kilometres. It became the first spacecraft to complete a successful close-up investigation of another planet, marking a major milestone in robotic space exploration.
The mission had been far from straightforward. Mariner 2 launched on August 27, 1962, following the failure of its predecessor, Mariner 1. During its journey, the spacecraft encountered technical problems, including issues affecting its power supply. Nevertheless, it continued transmitting scientific measurements as it travelled towards Venus.
Mariner 2 did not take the kind of photographs of Venus that students might expect from a modern planetary mission. Instead, its instruments measured properties such as microwave and infrared radiation, magnetic fields and particles in space. During its 42-minute encounter, its radiometers gathered data that helped scientists estimate the planet's surface temperature despite the thick clouds that prevent ordinary visible-light observations of the surface.
The results challenged popular ideas about Venus. Because Venus is similar in size to Earth, it had sometimes been imagined as a warm, potentially Earth-like world. Mariner 2's measurements showed that its surface was far hotter than many people had expected. Its findings supported the explanation that Venus's carbon-dioxide-rich atmosphere traps heat through a powerful greenhouse effect. The spacecraft also collected evidence about the solar wind, a stream of charged particles flowing outward from the Sun.
The encounter demonstrated that spacecraft could investigate a planet remotely, using carefully designed instruments to collect information that could not be obtained through ordinary telescopes alone. Later missions would build on this work, sending landers, atmospheric probes and orbiters to study Venus in greater detail.
A classroom connection: how do we study a world we cannot see?
Mariner 2 is a strong starting point for discussing how scientists gather evidence when direct observation is difficult. Students can compare visible-light cameras with infrared and microwave instruments, then consider why different kinds of measurements reveal different properties of a planet.
A useful discussion question is: How can scientists estimate the surface temperature of a planet hidden beneath thick clouds without landing on it? Students can first propose possible methods, then investigate how instruments detect radiation and how scientists interpret the measurements.
This event also connects naturally to greenhouse gases and planetary habitability. Students could compare Earth and Venus, considering how atmospheric composition, pressure and the balance between incoming and outgoing energy influence surface conditions.
For a ready-to-use space lesson, the free Jupiter's Moons resource set offers infographics, slides, a podcast and questions that help students explore how scientists investigate worlds beyond Earth. The Space Exploration reading comprehension resource is another option for connecting historical missions with scientific literacy.
Nostradamus and Renaissance medicine
December 14 is also traditionally given as the birth date of Michel de Nostredame, born in 1503 in what is now southern France. Known today as Nostradamus, he became famous for his cryptic writings about future events. Yet his life also provides a glimpse into medicine during the Renaissance, when physicians and apothecaries worked in a world with very different ideas about disease.
Nostradamus studied medicine and worked as a medical practitioner and apothecary. He lived during repeated outbreaks of plague, a devastating infectious disease that caused enormous suffering across Europe. Historical accounts associate him with treating people during outbreaks, although the details of his education, methods and success should be treated cautiously rather than assuming that later stories are all reliable.
Medical practitioners in the sixteenth century did not have access to germ theory, antibiotics or modern diagnostic tests. Ideas about disease were influenced by older medical traditions, observations of symptoms and explanations that we now know were incorrect. Some practitioners used herbal preparations and changes in diet or living conditions, while the causes of many infections remained poorly understood.
This does not mean that people in the past lacked observational skills or that every treatment they used was ineffective. It means that their explanations and options were constrained by the evidence and tools available at the time. Understanding this distinction is important when studying the history of medicine: a person can be influential in their own historical context without their ideas meeting modern standards of scientific evidence.
Nostradamus is therefore an interesting figure for examining how reputations develop. His prophecies are often interpreted after events have occurred, raising questions about ambiguity, confirmation bias and how people decide whether a claim has genuinely predicted something.
A classroom connection: how do we evaluate a medical claim?
Students can compare a historical explanation of disease with the modern scientific understanding of infection. They might ask what evidence would be needed to establish whether a treatment works, why controlled comparisons are useful, and how researchers distinguish an apparent improvement from an effect caused by the treatment itself.
Nostradamus also offers an opportunity to discuss the difference between a claim that sounds convincing and one that can be tested. Students could examine a short prediction, identify different ways it might be interpreted, and decide what would count as clear evidence that it had been accurate.
For a wider health-science connection, browse the Teaching Astrophysicist resource store for science reading passages and activities across biology, medicine, chemistry, physics and other subjects. There are free and paid resources available, making it possible to choose an activity that fits the time and needs of a particular class.
Bringing December 14 into the classroom
These three events are different, but each asks students to think about how we know what we know. Planck's work shows how experimental evidence can expose limitations in an established model. Mariner 2 demonstrates how instruments can extend scientific observation beyond Earth. Nostradamus's medical career provides a historical perspective on the evidence, assumptions and limitations that shape explanations of health.
They can be used as a short lesson starter, a discussion prompt or the beginning of a longer investigation. Ask students to choose one event and explain what changed as a result: a scientific model, our knowledge of another planet, or the way we understand medical claims.
For teachers who want to use historical science regularly without having to prepare a new activity every day, my December Science on This Day resource set includes 132 STEM events across the 31 days of December. It comes with an interactive HTML version with date and subject filters, classroom display mode, discussion questions and favourites, alongside editable slides, a spreadsheet and a printable PDF. You can select a single event for a quick warm-up or use several to build a discussion around a particular science topic.
What else happened in science during December?
December's calendar has plenty more events to draw on. On December 15, the Soviet Venera 7 probe became the first spacecraft to transmit data from the surface of another planet, providing a natural continuation of the story of Venus exploration. The same date marks the birth of physicist Henri Becquerel, whose work led to the discovery of spontaneous radioactivity, and the first rendezvous between two crewed spacecraft, Gemini 6A and Gemini 7, in 1965.
December 16 brings the development of the point-contact transistor in 1947, a milestone in the electronics that eventually made modern computing possible. It is also the birthday of science-fiction writer Arthur C. Clarke, whose writing helped popularise the idea of using geostationary satellites for global communication.
December 17 offers a different mix of engineering and fundamental science. In 1903, the Wright brothers completed the first controlled, sustained, powered flights by a heavier-than-air aircraft. In 1938, experiments by Otto Hahn and Fritz Strassmann produced evidence of nuclear fission, a discovery that would transform nuclear physics.
Later in the month, December 18 is associated with the launch of Project SCORE, an early communications satellite, and the birth of physicist J. J. Thomson, whose experiments helped establish the electron as a subatomic particle. December 21 marks the launch of Apollo 8 in 1968, the first crewed mission to travel to the Moon and enter lunar orbit, as well as the discovery of radium by Marie and Pierre Curie in 1898.
These dates offer opportunities to connect scientific discoveries with engineering, society and the development of technology. You can explore all 132 events and choose the ones that suit your curriculum in the December Science on This Day calendar.
A short science-history moment can be more than a date to memorise. Used well, it gives students a reason to ask questions, examine evidence and see how scientific understanding develops over time.
Thanks for reading
Cheers and stay curious
Oliver - The Teaching Astrophysicist
