This thesis discusses several questions regarding the double ramification cycle as a Chow class on the moduli space of stable n-pointed genus g curves using tools from so-called logarithmic geometry.

Astronomers have found complex organic ice outside the Milky Way for the first time. The discovery shows that the building blocks of life could arise early in the universe - and under a variety of conditions, said Leiden astronomer Will Rocha.

LUCIS organiseerde op woensdag 4 maart een speciale avond over journalistiek in Irak. Journaliste Judit Neurink en programmamaker Sakir Khader vertelden over hun ervaringen en recente werkzaamheden in het land. De avond stond onder leiding van Wendelmoet Boersema (politiek redacteur van dagblad Trou…

Two talented academics from Leiden who recently obtained their PhD have been awarded a Rubicon grant by the Dutch Research Council (NWO). The grant enables them to gain experience at a knowledge institute abroad.

How does a honey bee see the Earth? Or a shark? What would the world around us look look like through an infrared camera? And how can you spot Earth from the International Space Station and other satellites? Come and experience it yourself at the Night of Arts and Sciences!

The METIS instrument that’s being built for ESO's future Extremely Large Telescope (ELT) in Northern Chile under the leadership of the Dutch Research School for Astronomy (NOVA) has reached an important milestone: the preliminary design has been approved.

Science education project Space Awareness engaged 230,000 people in 68 countries with the excitement and challenges of space sciences and technologies. After three years, the project coordinated by Leiden Observatory came to an end in March and has now been evaluated.

An international team of astronomers led by scientists from Leiden Observatory has for the first time characterised a dust disk surrounding a young super-Jupiter, which is either a giant planet or brown dwarf. They detected infrared emission from the disk which might indicate that moons may have formed.…

Until 15 May, Open Space will give room for artistic creation and experimentation in a partnership between artists and astronomers. The project is a collaboration among Nederlands Dans Theater (NDT), Korzo and the Leiden Observatory. Starting on 3 May, young dancers of NDT 2, three choreographers, three…

An international team of laboratory astrophysicists and astrochemical modellers has shown that glycine, the simplest amino acid and an important building block of life, can form under the harsh conditions that govern chemistry in space. The results have been published this week in Nature Astronomy and…

The Werkgroep Leidse Sterrewacht (WLS) is an amateur association that, in addition to organising public activities, is also heavily involved in maintaining the historical telescopes in the Old Observatory.

Afgelopen zondagavond, 22 augustus, is na een kort ziekbed onze zeer gewaardeerde collega professor Wim Jiskoot, Hoogleraar Technologie van toediening van medicijnen, overleden. Wim werd twee weken geleden onverwachts geconfronteerd met het feit dat hij een vergevorderd stadium van kanker had, waarvoor…

Spatial analysis on the basis of material culture has always been one of the major topics in archaeological research. Designating Place analyses the urban space of Roman Ostia and Pompeii in different ways, namely via geophysical analysis, spatial analysis, iconographic analysis and epigraphic analy…

They hurtle along at over a thousand kilometres per second: the fastest stars in the Milky Way. PhD candidate Fraser Evans conducted research into these elusive hypervelocity stars and discovered that they have a lot to teach us, about black holes and supernovae, for example.

Space diplomacy, defined as ‘processed of dialogue that result in outcomes of cooperation or conflict on a given space issue’ [1], has shielded space from great power conflicts playing out elsewhere – both during the Cold War and in the decades that followed.

A symposium on space diplomacy for experts and the general public will take place in The Hague on Monday 12 June. Everyone has an interest in learning more about this topic, says Professor Jan Melissen. ‘The scope of international relations has expanded beyond our planet.’

Asteroids, pieces of matter orbiting round the sun, have turned out to be extremely valuable. Asteroid Psyche contains a quantity of metals that together are worth more than the entire global economy. NASA is heading for it.

The Univerisity of Sharjah organises a conference on February 22-23, 2017 ; Call for papers has started.

From the effects of hormone fluctuations in women via the interior structure of giant planets to the prehistory of the languages: six Leiden researchers have been awarded a Consolidator Grant by the European Research Council.

Tanja Masson-Zwaan, an assistant professor at the Institute of Air and Space Law, spoke on Friday 14 April about space mining on BBC Radio.

The Hague Space Resources Governance Working Group, hosted by the IIASL, has recently agreed on the Draft Building Blocks for the Development of an International Framework on Space Resource Activities and will present the outcome of its work during the NewSpace Europe Conference in Luxembourg. The Executive…

One of the ECSL’s most prominent activities is the ECSL Summer Course on Space Law and Policy, welcoming students at all academic levels as well as select young professionals currently active in the space or related sectors. Now in its 33rd year, the course has built a vast global network of alumni.

Lets hit the water! Our students joined us on Saturday 30 August 2025 for a Stand Up Paddleboarding (SUP) and canal clean-up session on Leiden’s canals with Plastic Soup Surfer Merijn Tinga.

With 8.9 million euros from the Danish National Research Foundation, Aarhus University and Leiden Observatory will establish the Center for Interstellar Catalysis. The centre is led by Aarhus professor Liv Hornekær and aims to find out how and when the building blocks of life formed in the Universe.…

Two teams of astronomers, including one from Leiden University, have discovered oxygen in the most distant known galaxy, JADES-GS-z14-0. This groundbreaking discovery shows that galaxies could form much faster in the early universe than was previously thought.

An international team of scientists, including Xander Tielens of Leiden Observatory, has used space telescope Hubble and the ALMA observatory to show that UV radiation from massive stars can prevent planets from forming. The researchers publish their findings on 1 March in the journal Science.

NASA’s telescope SOFIA has provided a new glimpse of the chemistry in the inner region surrounding massive young stars where future planets could begin to form. Leiden PhD candidate Andrew Barr writes about it in the Astrophysical Journal. The scientists found massive quantities of water and organic…

Leiden team runner-up in the European Regional Round at the Manfred Lachs Space Law Moot Court 2016!

An international team of astronomers has shown in a laboratory at Leiden University (the Netherlands) that methane can form on icy dust particles in space. The possibility had existed for quite some time, but because the conditions in space were difficult to simulate, it was not possible to prove this…

Building more in urban areas is, in most places in the Netherlands, the smartest way to tackle the housing crisis. This is evident from research conducted by Janneke van Oorschot, published in a partner journal of Nature. Remarkably, this does not have to come at the expense of green spaces in cities.…

Als gevolg van de grote technologische vooruitgang in de gezondheidszorg worden in toenemende mate gegevens verzameld tijdens de uitvoering van klinische onderzoeken.

German scientists and NASA have developed a bacteria-killing coating for space toilets. With this coating they hope to protect astronauts in space stations from pathogens. Professor of Biological chemistry Nathaniel Martin sheds light on the discovery: 'You don't expect nasty bacteria up there, but…

On 10-11 October, the conference "The Charter's Spaces" will take place at the University of Namur. The programme has now been published.

The LOFAR radio telescope produces petabytes of data every year. Radio Astronomers use complex multi-step pipelines to process this data and produce scientific images.

Promotor: Prof.dr. H.V.J. Linnartz, Co-Promotores: H.M. Cuppen, S. Ioppolo

The project ‘Founding an Inclusive Space’ investigates the histories of various LGBT+ archives in the Netherlands, Germany and the United Kingdom.

This research combines archaeological, archaeometric and ethnohistorical research to study the organisation of settlement space and residence rules among the Taino Indians during the Late Ceramic Age (AD 1000-1492).

Leiden University will be 444 years old this year and is still very much alive and kicking. But how can we humans grow old healthily? Hanno Pijl at LUMC is the grand master of lifestyle medicine. He explains how we can all benefit from a sensible - but still enjoyable - lifestyle.

The SRON space research institute currently located in Utrecht will be relocating to South Holland. The institute, which constructs highly advanced technological instruments for astronomy research and for research on exoplanets, will relocate to new premises adjacent to Leiden University's Science Campus.…

Wordt het nog wat met de Arabische lente?

Amino acids are the building blocks for life on earth. They may originate in space and reach the Earth via comets and meteorites. Daniël Paardekooper examined part of this hypothesis. PhD defence on 5 July.

The Leiden University Green Office is pleased to announce its Spring Podcast competition -- Beyond the Safe Space -- on the theme: the Planetary Boundaries.

Could water be present in planet-forming disks before the formation of rocky planets? The James Webb Space Telescope may have found evidence for that. Webb has for the first time observed water in the inner disc around young star where at greater distance, giant planets have already formed. The research…

Astronomers want to understand the Universe, from the Big Bang to the present day, and what the future will hold. In Leiden they focus on two key questions: ‘How did stars and planets originate’ and ‘How were galaxies and black holes formed in the young Universe?’ A new generation of telescopes – just…

The Old Observatory of Leiden is the oldest existing university observatory in the world. While students from Leiden University attend lectures in the main part, the visitor center in the basement and the telescopes on the building serve the general public. On this website, you will find information…

Nederland ligt in de periferie van het verhaal van menswording. De evolutie van onze familie vindt lang exclusief in Afrika plaats. En, als Europa eenmaal bewoond wordt door mensachtigen, ligt het zwaartepunt ten zuiden van onze streken. Toch heeft ons land een aantal interessante vindplaatsen en vondsten…

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…

On this section of the website you can find more information about the Old Observatory and the current astronomy research institute.