Four university medical centres, including the LUMC, are joining forces to increase pandemic preparedness in the Netherlands.

A European team of astronomers has discovered the largest stellar black hole in the Milky Way. It is more than thirty times as massive as our sun and is located in the constellation of Aquila, about two thousand light-years from Earth. The astronomers stumbled upon the black hole by chance while preparing…

During the 80th session of the Geneva-based Institut de Droit International, Aleydis Nissen was awarded the Andrés Bello Prize. The competition was established by James Brown Scott in 1931 and is carried out under the auspices of the Institut.

Concrete actions for assessment panels, boosting responsible evaluation

Minims are letters that are made up of short, vertical pen strokes, such as 'm', 'i', 'n' and 'u'. In Gothic script, there is often little distinction between letters composed of minims. Assistant professor of medieval literature Krista Murchison has written an article in History Today on the hidden…

How can Europe lead the way in vaccine development that is fast and for all? To answer this pressing question, Professor of Vaccinology Meta Roestenberg is holding a panel session on 14 July at the EuroScience Open Forum in Leiden.

Ilze Bot wants to reduce the prevalence of cardiovascular diseases. Her research focuses on mast cells, which protect us from infections but can also make us ill.

Researchers from Leiden University, McMaster University and Public Health Ontario are calling on colleagues to track down archival specimens of mosquitoes from museums and other collections and to examine them with modern methods. This will tell them more about malaria transmission.

The European Space Agency (ESA) has published an interim data release from Gaia, the space telescope mapping out the Milky Way in 3D. The first scientific papers published today reveal half a million stars in the Omega Centauri globular cluster, nearly 400 candidate gravitational lensers and the positions…

At the end of the 7th century something curious occurs in Northwestern Europe. Suddenly, people start burying the dead next to their dwellings instead of in communal cemeteries. Professor Frans Theuws recently published a book on this phenomenon. ‘We wanted to know if the study of these farmyard burials…

Large pairs of planets thought to orbit each other without a star, do not exist after all. That conclude Leiden researchers, after extensive computer modelling and simulations. What the double dots seen by the James Webb Space Telescope are, remains a mystery.

ESA’s space telescope Gaia, which maps the Milky Way, completes its active phase of scanning the sky on 15 January. Over the past decade, Gaia has made more than three trillion observations of about two billion stars and other cosmic objects. ‘Gaia is already the discovery machine of the decade,’ Leiden…

Lecture

Every Political Science master’s student at Leiden University completes their degree with thesis. The thesis provides students with the opportunity to pursue a topic of their choosing in depth and conduct independent research. It is a demanding task that requires dedication, attention to detail, and…

On Prinsjesdag, 16 September 2025, the Faculty of Governance and Global Affairs (FGGA) opened the new faculty year with a reception at Wijnhaven. The opening was dedicated to the university’s lustrum theme: ‘Ahead of Time’.

Planets existing in other solar systems contain invaluable information about the origin of planets and life. PhD candidate Yapeng Zhang has studied their atmospheres by looking at their smallest parts: isotopes. With her research she hopes to discover what makes our own solar system unique.

A time-lapse of the universe in more detail than ever before: that’s the aim of the NSF–DOE Vera C. Rubin Observatory in Chile, which will unveil its first images of the night sky on 23 June. Researchers at Leiden Observatory have played a major role in making it all possible.

The university is home to many pearls of research institutes that do not make the news every day. The Executive Board visited one such pearl, the Institute of Philosophy, on Tuesday 1 July. It resulted in an inspired conversation.

Plants can’t run away from enemies. Still, it would like to keep life-threatening herbivores at a distance. This can be done with odours. Klaas Vrieling of the Institute of Biology Leiden found out with his team how plants change odour production to keep the munchers at a distance.

Dutch mosquitos are more resilient to saltwater than previously thought. Environmental scientist Sam Boerlijst discovered this during his PhD research at the Hortus botanicus. This knowledge is crucial for understanding how mosquito-borne disease transmission might change in the future.

In the nationalist nineteenth century, people developed an interest in medieval language and literature. The study of medieval material in one’s own vernacular was thought to reveal a great national past. But why, then, was Old English studied by Germans, Danes, Italians and many other nationalities…

Lecture, Astronomy on Tap

Lecture, CMGI Brown Bag Seminar

Lecture, CMGI Brown Bag Seminar

Lecture, CMGI Brown Bag Seminar

Lecture, CMGI Brown Bag Seminar

Lecture, CMGI Brown Bag Seminar

Lecture, Leiden University Environmental Humanities Series

How can we cooperate better as a Faculty? Both with each other and with the outside world. Around 70 students and staff discussed this during the latest strategy session in Corpus. Keynote Harry van Dorenmalen, former president of IBM Europe: 'You know best what this Faculty stands for and what it n…

Prisoners who are visited regularly by family or friends are less likely to be reconvicted in the short term than inmates who rarely or never receive visits. Visits should therefore be encouraged and facilitated, according to PhD candidate Maria Berghuis, who will defend her doctoral thesis on 23 June…

From 13 to 16 July, Leiden will host the EuroScience Open Forum (ESOF), the largest multidisciplinary scientific conference in Europe. Lars van Doorn from Leiden Law School will give a presentation.

This week, around 1,200 brand new students from 68 different countries are getting to know each other and their new student city. Orientation Week Leiden (OWL) got off to a good start on sunny Lammermarkt, which was packed with enthusiastic internationals.

The James Webb Space Telescope continues to surprise us with stunning pictures, but of what exactly? Astronomer Nienke van der Marel shows with three images how massive stars lead short but explosive lives.

A staggering 6.5 billion chicks are killed worldwide every year. These are generally male chicks that are of no economic value. In Ovo has developed technology that can quickly determine the sex of a chick, to ensure that only female chicks are hatched. The first 150,000 chicks have now hatched in this…

‘We may have taken steps together, but there is still much to do in the fight against racism and discrimination’, says Annetje Ottow, President of Leiden University’s Executive Board. ‘We have to be aware of this and continue to focus on this difficult, uncomfortable and often confronting topic.’

With a self-converted red camper van, biologists and twin brothers Kevin and Marvin Groen go on a nature adventure in Eastern Europe. Together, they search for wild animals, beautiful nature and places to sport. From a long search for a bear in the Slovakian wilderness to the discovery that pelicans…

De klimaattransitie is in volle gang: de vervuilende industrie moet plaatsmaken voor duurzame productiemethoden. Werknemers in deze industrie zullen hierdoor nieuwe banen moeten vinden. Dat zal niet iedereen lukken. Heb oog voor die groep, waarschuwt politiek econoom Lars van Doorn.

The nominees for the IRO Thesis Prize 2025 and the Prof. Dr. J.Th.J. van den Berg-prijs 2025. Who authored the best thesis in Leiden University’s bachelor’s programme in Political Science?

More than 700 visitors got to know the Science Faculty during the Leiden Science Family Day. People of all ages could enjoy fascinating experiments, tours, interesting lectures, spectacular nitrogen shows and various workshops. It was an informative day with many (future) scientists, amazement and,…

Leiden University will be conferring three honorary doctorates in its special anniversary year. They will be awarded to Eliot Higgins, truth finder and founder of Bellingcat, Bonnie Honig, expert in feminist theory and legal theory, and Kelly Chibale, professor of organic chemistry, who works on prevention…

Today, ESA’s Gaia mission releases its new treasure trove of data about our home galaxy. Astronomers, led by the Leiden astronomer Anthony Brown, describe strange ‘starquakes’, stellar DNA, asymmetric motions and other fascinating insights in this most detailed Milky Way survey to date.

In June 2024 the Faculty of Archaeology welcomed a new Assistant Professor. Dr Alejandra Roche Recinos, originally from Guatemala, will strengthen the Faculty’s expertise on the archaeology of Central America. ‘I want to explore the lesser known archaeology of Southern Guatemala.’

During the annual graduation ceremony, not only were the Bachelor's students in Political Science honoured, but also those students who had written exceptional theses. The thesis prizes reward work that excels in originality, social relevance and academic quality. This year's winners are Ronny Wijling…

Bezoek

Symposium

PhD defence

We should mention differences in skin colour to our children because only then can we talk openly about prejudice and racism – and how to prevent them. This is what Professor Judi Mesman says in her book ‘Opgroeien in kleur’ (Growing up in Colour), which offers advice to parents. ‘Why is there only…

PhD defence

Lecture, LUCIS What's New?! Series

Conference, Roundtable