With new algorithms and supercomputers, an incredibly detailed radio map of the universe was created. Now astronomers can look at radio data of galaxies with much more precision. This was published in Nature Astronomy by Leiden PhD student Frits Sweijen and colleagues.

Below thesis archives will be moved shortly (work in progress) to the Leiden Repository. Once this is done, theses submitted by MI students (from 2008 onwards) can be accessed via the Repository and will be removed from this site.

What is our place in the Universe? How did stars, planets, and galaxies form? Could life exist beyond Earth? The minor Our Universe invites you on a journey through space, time, and society. You will explore the scientific story of modern astronomy, the origins of life, and the role of the cosmos in…

OB associations are loose groups of young, massive stars. They constitute the last stage of the massive starformation process, and the context in which new stars are formed.

An international team of astronomers has found an unexpected link between dark matter and visible stars in stellar systems. This discovery may even cause us to reconsider our understanding of gravity. They published on their discovery in 'Nature' on 1 October.

For centuries astronomers studied the Universe by collecting light. Nowadays, we are living in times of great technological advancements, which allow us to explore our Universe in a new way - though gravitational wave radiation.

Stellar feedback is a crucial ingredient in the evolution of galaxies.

Promotores: Prof.dr. A.G.G.M. Tielens & Prof.dr. L. Kaper (UvA)

One of the most important puzzles in modern astrophysics is the nature of dark matter.

The focus of this thesis is how stars like our Sun and planets like Jupiter, Saturn, and Earth are formed.

Leiden Observatory is the astronomical institute of the Faculty of Science of Leiden University.

Promotor: S.M. Verduyn Lunel, Co-Promotores: S.C.Hille, O.W. van Gaans

On 22 June, Anneke Koning defended the thesis 'Return to sender: a multi-method study of guardianship against transnational sexual exploitation of children'. The doctoral research was supervised by Joanne van der Leun, Masja van Meeteren and Johan van Wilsem.

When a physical system possesses symmetries, these are often accompanied by a representation of the symmetry group on a Hilbert space. Group representations on Hilbert spaces have been extensively studied.

An unexpected phenomenon in a merger of a cluster of galaxies. An international team of astronomers led by Francesco de Gasperin has witnessed a gas tail of a galaxy, that slowly extinguished, but then lightened up again

An international team of researchers observed the full extent of the evolution of hot gas produced by an active black hole for the first time. As it evolves, the hot gas encompasses a much larger area than previously thought and even impacts objects residing at great distances. Their study is published…

The solar system was formed approximately 4.56 billion years ago. Despite the numerous theories that have been developed over the years, the formation and evolution of the solar system still remain unclear.

The Astronomy and Data Science master’s specialisation at Leiden University combines advanced Astronomy courses with relevant courses from the Computer Science programme at Leiden University.

The ability to collect and interpret huge quantities of data has become indispensable to society and academia. Leiden University is a knowledge and expertise centre for data science that places the emphasis on interdisciplinary collaboration and innovation.

Three projects with Leiden researchers are to receive a subsidy from NWO for the construction or renovation of large-scale research facilities. They will be working on electron microscopy, an X-omics initiative and an X-ray telescope. The projects are part of the National Roadmap for Large-Scale Scientific…

At Leiden Observatory, researchers investigate the origin of stars and their planetary systems. They detect and characterize planets around other stars (exoplanets). They study how stars and planets form. And they follow molecules from interstellar clouds to nascent planet systems. This way they address…

The LOFAR e-infrastructure group is responsible for deploying and maintaining LOFAR processing on distributed e-infrastructure. A co-operation between SURFsara, Leiden University and ASTRON, the group develops software to integrate the LOFAR stack with processing pipelines. Our software can schedule…

From the Big Bang to superconductivity. Many ground-breaking discoveries have been made in Leiden University’s long history.

We are grief-stricken that our PhD student Maolin Zhang passed away during the early morning of January 17th 2019. He died during a terrible fire that took place at his house in Hillegom.

Met AI kunnen nieuwsredacties razendsnel beelden genereren — maar tegen welke prijs? Dit onderzoeksrapport opgesteld door prof. dr. Jaap de Jong, dr. Astrid Vandendaele, Maartje van der Woude en Stef Arends (Universiteit Leiden), baseert zich op 59 interviews met beeldmakers, redacteurs en experts uit…

Knowledge that benefits society is the domain of the Faculty of Governance and Global Affairs (FGGA). FGGA provides high-quality interdisciplinary education on and research into social and governance issues such as terrorism, organisation of public administration, climate change and economic crises.

This thesis is about cosmological inflation and its relation to observations.

The Sun and all the stars in the night sky reside in the Milky Way galaxy. In the at-rest reference frame of the Galaxy, typical stars travel with velocities of about 100-200 kilometres per second.

Promotor: A.P. IJzerman

Promotor: A.P. IJzerman

Managing scarcity to serve the public interest is a classic government task. An important way to execute this task is by allocating individual rights that are only available in limited quantities, such as CO2 emission allowances, gambling licences, subsidies, radio frequencies, public contracts and…

The Mathematical Institute has a rather liberal management structure. Tasks and responsibilities are distributed among the staff. Important decisions are taken by consensus. Various organisational divisions are featured below.

The Leiden astronomer Huib van Langevelde) has been selected as the new director of the Event Horizon Telescope (EHT). The EHT is a collaboration involving about 350 scientists from 18 countries. It combines the ALMA array in Chile with sub-millimeter telescopes around the world and published the first…

The Old Obervatory Leiden is one of the partners of the local learning ecosystem ‘Verwonder om de Hoek’, an educational platform from Leiden that lets school children and families wonder about the world of Nature, Science, Technology and Sustainability. On this page you will find the educational programmes…

Leiden astronomer Tim de Zeeuw has been appointed Knight in the Order of the Dutch Lion. He received the distinction on 14 May to mark his departure as Director General of the ESO European Astronomy organisation. The celebration took place during the 2018 Dutch Astronomers Conference in Groningen.

In this thesis we use state-of-the-art observations and simulations to provide the best constraints to date on the HVS ejection rate and constraints on the stellar content and dynamics at the GC, including the progenitor binary populations and their star formation history.

Leiden was European City of Science in 2022: for a year Leiden was the capital of European science. Leiden University was a proud partner of Leiden2022.

Combining different disciplines, researchers work together to formulate innovative solutions to societal problems.

Promotor: Prof.dr. S.F. Portegies Zwart, Co-promotor: D.C. Heggie

This thesis revolves around the electronic spectroscopy of molecules in the laboratory and the search for the carriers of the diffuse interstellar bands (DIBs).

Promotores: S.F. Portegies Zwart, E. M. Rossi

One of the most important correlation functions in physics, especially in cosmology, is the energy density, which describes how much energy is present at each point in spacetime due to matter fields. A key contribution to the energy density of the primordial universe comes from gravitational waves (GWs),…

Our research primarily focuses on the early universe and its origins in theories that go beyond the Standard Model of particle physics.

My work is motivated by the necessity to extend Standard Model of Particle Physics in order to explain three observed phenomena that this great theory fails to accommodate

Promotor: M. de Jong, Co-Promotor: Samtleben

Organic molecules in interstellar space are important as they influence the structure of galaxies and star formations. Studying catalytic processes in space allows us to understand how molecular species are formed and chemically evolved in the interstellar medium and solar system objects.

The high velocity tail of the total velocity distribution of stars provides essential insight into fundamental properties of the Galaxy.

On Saturday October 16, the special exhibition ‘Shared Sky: Canvases of the Universe’ opens in the Old Observatory in Leiden. The exhibit takes a cultural look at the starry sky by Aboriginal Australian and South African artists, and features colorful artwork that explores how these Indigenous cultures…

The field of science communication is very broad. Below is a list of organisations where SCS students can fulfill internships or where alumni have found jobs.