Visiting the particle accelerator in Darmstadt: GSI/FAIR tour, Science Pop-up and space destinations

Particle accelerator in Darmstadt: what is GSI/FAIR, and can you visit it?

Since its founding in 1969, six new chemical elements have been discovered at GSI in Darmstadt, including element 110, named after the city: darmstadtium. The darmstadtium congress centre on the Schlossgraben bears the same name. Alongside the existing accelerators, FAIR is currently being built: an international facility with a superconducting ring accelerator 1,100 metres in circumference. Darmstadt Tourismus counts FAIR among the largest research projects in the world. Researchers want to create matter there that otherwise only exists in space, in order to better understand how the universe has evolved from the Big Bang to the present day.

You can see both: the operating facilities and the construction site. The tours are free and open to everyone aged 12 and over, whether an advanced physics class, a technology club or a family with teenagers. No date has currently been published for an open day at GSI/FAIR (as of Oct 2026). If you’re hoping for one, keep an eye on the news on gsi.de. A regular visit is easier to plan.

Booking a particle accelerator tour: dates, age and what to expect

First, an introductory talk explains the facilities and research at GSI and FAIR. Then you visit selected research stations and finally the viewing platform overlooking the FAIR construction site. According to GSI, the following applies (as of Oct 2026):

• Admission: free.
• Age: 12 and over.
• Registration: You reserve a date from the list on the GSI website and can add more people to your reservation. In early October 2026 the list was empty, but GSI releases new dates at regular intervals, so it’s worth checking again after a few days.
• At least ten participants: A visit only takes place with ten or more people. If too few sign up, GSI will let you know in good time.
• School classes: There are separate dates for them on a subpage of the GSI website.
• Questions: by email to besichtigung@gsi.de.
• In English: Dates in English are listed on the English version of the page – handy for international PhD students and visiting researchers.
• Accessibility: Allow for a good 1,000 metres of walking. Most paths are level and wheelchair-accessible. People with pacemakers may not enter certain areas.

Our tip: fix the tour date first and plan your trip around it. Because a tour only goes ahead with ten or more people, it’s best to register together with colleagues, friends or your club.

No dates available? Then there’s the lecture series „Wissenschaft für Alle“ (Science for Everyone): researchers explain their topics on Wednesdays at 14:00 in the GSI/FAIR lecture hall or via Zoom. For a seat in the lecture hall, register online; registration opens on the day of the previous event. You can join via Zoom without registering. According to GSI, you need an official photo ID to enter the campus. Coming up next are 21 October (X-ray spectroscopy), 18 November (cosmic rays from the accelerator) and 9 December 2026 (insights into the 2026 experiment programme).

No booking needed: hands-on particle physics at the Science Pop-up

The GSI/FAIR SCIENCE POP-UP at Ernst-Ludwig-Straße 22 is the shortcut for anyone who is spontaneous or not yet 12. Behind the shop window in the pedestrian zone are hands-on stations on atomic nuclei, particle accelerators and cosmic processes. Outside, shopping bags pass by; inside, you go particle hunting yourself. According to GSI, the space is designed for curious minds aged 5 to 95, and admission is free.

• Opening hours: Tuesday to Friday 12:00–17:00, plus the Saturdays 24 October, 14 November and 5 December 2026, each 10:30–16:00 (as of Oct 2026).
• School classes: Whole classes can come by appointment, also outside opening hours. From year 9, the school lab offers activities including building your own cloud chamber, in which particle tracks become visible.

From the Orangerie, tram 3 takes seven minutes to the Schloss stop, and then it’s just a few steps. The Pop-up fits into a lunch break between two appointments or a grey afternoon. More ideas for days like these can be found in our article Darmstadt on a rainy day.

Getting to Wixhausen: S-Bahn, tram and bus G

GSI is located in Wixhausen, Darmstadt’s northernmost district. According to GSI, there are two ways to get there:

1. Via the main station: From Darmstadt Hbf, take the S6 suburban train (S-Bahn) towards Frankfurt two stops to Wixhausen. There, take bus G towards GSI to the „Darmstadt-Wixhausen GSI Helmholtzzentrum“ stop, one after „Wixhausen Merianstraße/GSI“. The bus stop is on the other side of the tracks and can be reached via a pedestrian underpass. From the Orangerie to the main station takes 19 minutes on tram 3.
2. Via the city centre: Take the tram towards Arheilgen to the Dreieichweg terminus and change to bus G there. From the Orangerie to Luisenplatz takes ten minutes on tram 3.

Important: bus G only runs Monday to Friday. At weekends, or if you want to stretch your legs, according to GSI it’s a 25- to 35-minute walk from Wixhausen S-Bahn station: turn right onto Messeler-Park-Straße in the direction of travel, cross the main road and keep going straight to the end of the street. Check lines and departures in the RMV or HEAG mobilo journey planner before you travel. During the autumn school holidays until 18 October 2026, for example, tram 3 runs on a special timetable.

Space instead of atoms: tours at ESA/ESOC and EUMETSAT

In Darmstadt, it’s just a tram ride from particles to satellites. Since 1967, ESA space missions have been planned and controlled at the European Space Operations Centre ESOC. Since 1986, EUMETSAT has been observing weather and climate from space from Darmstadt. Public tours are booked through Darmstadt Marketing and last 90 minutes each. According to Darmstadt Marketing, an adult ticket costs €14.50 (prices as of January 2025, please check before booking); reduced tickets are available for pupils, students and pensioners, among others. From age 16 you need a valid ID card.

• ESOC tour in Darmstadt: normally on Mondays at 14:00 and on Wednesdays and Fridays at 17:00, from age 10. No more public tours are being offered in 2026, and the group tours until December are fully booked too. There is no information yet for 2027. If tickets are returned at short notice, Darmstadt Marketing puts them back online, bookable up to one week before the date. So make a note of it and check the ticket shop early. The ESA Open Day on 2 October 2026 was also sold out.
• EUMETSAT tours: on Fridays at 15:00 and every other Wednesday at 15:00, from age 12. According to Darmstadt Marketing, groups book for the second half of 2026 on request by email, while individual tickets are sold via the online ticket shop, where you can see whether places are still available.

According to ESA, trams 4 and 9 run from Luisenplatz to „TZ Rhein Main“ or „Maria-Goeppert-Straße“ for ESOC. The free city tour included with the Darmstadt Card does not apply to ESA and EUMETSAT. Our guide to Darmstadt, City of Science gives an overview of universities and institutes.

Science weekend: combine the observatory, the Landesmuseum and Messel Pit

Two nights are enough for a weekend of particle physics, the starry sky and around 47 million years of Earth’s history. Here’s what it could look like in early December 2026:

• Friday, 4 December: Arrival, self check-in, Science Pop-up at lunchtime. If you have got a GSI date, schedule it on a weekday like this one – then bus G is running too.
• Saturday, 5 December: The Pop-up is also open on this Saturday (10:30–16:00). In the afternoon, head to the Hessisches Landesmuseum (Hessian State Museum) with fossils from Messel Pit, Art Nouveau and the „Block Beuys“. It is open on Saturdays 11:00–18:00, and children and young people up to 18 go free (as of Oct 2026). At 19:30, the observation evening „Sterne über Darmstadt“ (Stars over Darmstadt) begins at the Volkssternwarte (public observatory) on the Ludwigshöhe. In small groups you look through the telescopes – registration required, and only if the sky is cloudless. According to the observatory, it’s about a 25-minute uphill walk from the Lichtenbergschule tram terminus (line 3). Bring a torch, as the paths are unlit. There is another observation evening on 7 November.
• Sunday, 6 December: Head to Messel Pit, Germany’s first UNESCO World Natural Heritage Site since 1995. From 16 November the visitor centre is open Wednesday to Sunday 10:00–17:00, until then daily (as of Oct 2026). More in our article on Messel Pit.

In the evening, cook in the kitchenette of your studio in Bessungen and sort the day’s photos at the desk. With the two-day Darmstadt Card (€15, as of Oct 2026) you travel by bus and train within the extended city area (fare zone 40), and at Messel Pit you get two admission tickets for the price of one. More ideas for two days in the city can be found on our page about a short break in Darmstadt.