astronomy

Nicolas Dauphas

Nicolas Dauphas is a astronomy topic covered in the lgStudy science library. This page brings together a partial reference excerpt, illustrations, worked examples, real-world applications and a short study plan, so you can understand Nicolas Dauphas rather than just read about it. In short: Nicolas Dauphas (born December 10, 1975) is a French-American planetary scientist and isotope geochemist. He is a Chair Professor of geochemistry and cosmochemistry in the Department of Earth and Planetary Sciences at the University of Hong Kong.

Key takeaways

Nicolas Dauphas belongs to astronomy; place it in that map before memorising details.
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Reproduce the core statement of Nicolas Dauphas from memory before moving on to harder problems.

Reference excerpt

Nicolas Dauphas (born December 10, 1975) is a French-American planetary scientist and isotope geochemist. He is a Chair Professor of geochemistry and cosmochemistry in the Department of Earth and Planetary Sciences at the University of Hong Kong. Within cosmochemistry, his research focus is on isotope geochemistry. He studies the origin and evolution of planets and other objects in the Solar System by analyzing the natural distributions of elements and their isotopes using mass spectrometers.

Career Born in Nantes in Brittany, France, Dauphas received a B.Sc. degree from École Nationale Supérieure de Géologie in 1998. The same year, he obtained an M.Sc. from Centre de Recherches Pétrographiques et Géochimiques, at the National Polytechnic Institute of Lorraine (French: L'Institut National Polytechnique de Lorraine; INPL). In 2002, also from INPL, he was awarded a Ph.D. in geochemistry and cosmochemistry, working with Bernard Marty and Laurie Reisberg. He then completed his postdoctoral research at the Enrico Fermi Institute of the University of Chicago and the Field Museum of Natural History from 2002 to 2004, before joining the faculty at the University of Chicago in 2004, where he stayed until 2025. In August 2025, he joined the Department of Earth and Planetary Sciences at the University of Hong Kong as Chair Professor to lead a new initiative focused on advancing planetary science and the study of terrestrial and extraterrestrial materials.

Recognition and awards In 2005, Dauphas was awarded Nier Prize of the Meteoritical Society which recognizes outstanding research in meteoritics and closely allied fields by young scientists. In 2007, he was awarded the David and Lucile Packard Foundation Fellowship, given to the most promising early-career scientists and engineers, across the US. He won the 2008 Houtermans Award, given by the European Association of Geochemistry for outstanding contributions to geochemistry. He was awarded the James B. Macelwane Medal of the American Geophysical Union (AGU) for "significant contributions to the geophysical sciences", and was selected as an AGU Fellow in 2011. In 2014, he became a Fellow of the Meteoritical Society. He was one of the finalists in 2017 for the Blavatnik National Awards. In 2016, Dauphas received a named professorship from the University of Chicago as the Louis Block professor, Physical Sciences Division. In 2019, Dauphas was elected Geochemical Fellow of the Geochemical Society and the European Association of Geochemistry in recognition of his career contribution to the field of geochemistry. On April 30, 2024, it was announced that Nicolas Dauphas had been elected to the National Academy of Sciences.

Research activities By analyzing the isotopic compositions of stable and radiogenic nuclides in meteorites, Dauphas investigates the timing and processes that lead to the formation of Solar System bodies and the establishment of habitable conditions on Earth and Mars. He used iron isotopes to study how the iron biogeochemical cycle of the Earth changed through time. He established that Mars was formed rapidly, within the first 2~4 million years of the birth of the Solar System, which explains the much smaller size of Mars compared to Earth and Venus. He first identified the mineralogical carrier of the 54Cr isotopic anomalies in meteorites as Cr-rich nano-sized spinels from supernovae. He constrained the nature of Earth's accreting materials through time, using a novel approach that relies on the different affinities of elements with Earth's core, and showed that the materials formed Earth are from an isotopically homogeneous reservoir. Dauphas was part of the preliminary examination team for JAXA's Hayabusa2 mission, which returned a fragment of Ryugu carbonaceous asteroid to Earth for scientific research. He was selected as a member of the Mars Sample Return Campaign Science Group in 2022.

Personal life Nicolas Dauphas married a fellow planetary scientist, Reika Yokochi. The couple had two children. In February 2024, Dauphas posted to his Twitter (X) account that Yokochi had died from EGFR-positive lung cancer. Dauphas states that he is of "French-American citizenship".

References

External links Nicolas Dauphas publications indexed by Google Scholar Nicolas Dauphas - AGU Fall Meeting 2018 - The Daly Lecture University of Chicago, Department of the Geophysical Sciences

Illustrations

Worked examples

Example 1 — a first encounter with Nicolas Dauphas

Start with the simplest possible case. Write down what Nicolas Dauphas claims or describes in one sentence, then invent the smallest concrete situation in which that sentence is true. In astronomy, the smallest case is usually a single object, a single equation or a single measurement. Check that every symbol or term in your sentence has a meaning in that case.

Example 2 — changing one variable

Take the situation from Example 1 and change exactly one quantity: double it, halve it, or set it to zero. Predict what should happen to Nicolas Dauphas before you calculate. Comparing your prediction with the result is the fastest way to find out whether you understand the idea or only the words.

Example 3 — an exam-style question

Typical questions about Nicolas Dauphas ask you to (a) state it precisely, (b) apply it to given data, and (c) explain a limitation. Practise writing all three answers in under five minutes; the third part is what separates a full-mark answer from an average one.

Applications of Nicolas Dauphas

In research: Nicolas Dauphas appears in astronomy research whenever the underlying quantities have to be modelled precisely. Papers usually cite it as a starting assumption and then explore where it breaks down.
In technology and industry: Engineering practice reuses Nicolas Dauphas in design rules, simulations and safety margins. Knowing the idea lets you read a specification sheet and understand why the numbers look the way they do.
In the classroom: Nicolas Dauphas is common in secondary-school and first-year university syllabi. It links to neighbouring topics 1975 births, American geochemists, French emigrants to the United States, so understanding it makes those chapters shorter.
In everyday life: Look for Nicolas Dauphas outside the textbook — in sport, cooking, traffic, electronics or the sky above you. An example you found yourself is remembered far longer than one you were given.

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How to study Nicolas Dauphas in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what Nicolas Dauphas means in your own words.
Compare your version with the excerpt and mark what you missed.
Work through the three examples above with pen and paper.
Explain Nicolas Dauphas out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is Nicolas Dauphas in simple terms?

Why does Nicolas Dauphas matter?

Because it connects several astronomy ideas at once: it gives you a definition you can apply, a quantity you can calculate, and a way to check whether a result is plausible.

How should I study Nicolas Dauphas?

Read the excerpt, restate it from memory, then work through the examples and applications listed on this page. The five-step study plan above takes about twenty minutes.

What does this page cover?

It gives you a compact reference excerpt plus original lgStudy explanations, examples, applications and study material on Nicolas Dauphas.