The Fête de la Science is the perfect opportunity to satisfy your curiosity with professionals and scientists, in Paris and throughout the Ile-de-France region. In the Yvelines region, theObservatoire de Versailles Saint-Quentin-en-Yvelines is giving children the chance to discover space, climate change and the world around them, thanks to a host of fun workshops. It's also an opportunity to meet real enthusiasts, who will be delighted to share their knowledge with you!
This observatory, founded in 2009, replaced the Institut Pierre-Simon-Laplace as the Observatoire des sciences de l'univers. A higher education and research establishment located in the town of Guyancourt, it is part of theUniversité Paris-Saclay, and specializes in astronomy and space sciences.
It houses research laboratories where scientists and students work on a variety of issues related to astronomy, astrophysics and cosmology. They carry out research on subjects as varied as star formation, galaxies, black holes, exoplanets and many other topics related to the universe.
Fête de la Science 2025 in Paris and Ile-de-France: the program of free events
The Fête de la Science is back from October 3 to 13, 2025 for its 34th edition! The idea? A week dedicated to scientific culture, with numerous free events all over France. Experiments, shows, open houses, visits and a host of workshops, open to all and adapted to children, await you in the four corners of Paris and the Île-de-France region! [Read more]
For its 15th edition, the Observatory explores all forms of intelligence, from nature to man and all the way to the end of the universe.
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Discover a new passion for science at this exceptional national event!
Dates and Opening Time
On October 12, 2025
Location
Versailles Saint-Quentin-en-Yvelines Observatory
11 Boulevard d'Alembert
78280 Guyancourt
Prices
Free
Official website
www.fetedelascience.fr



Fête de la Science 2025 in Paris and Ile-de-France: the program of free events














