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Sources and image credits — Weekend of Science: what is still open on Sunday 4 October

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A historic teaching room in the Sonnenborgh observatory and museum in Utrecht. Archive photograph, December 2023, for illustration; not a view of the 2026 Weekend of Science.
A historic teaching room in the Sonnenborgh observatory and museum in Utrecht. Archive photograph, December 2023, for illustration; not a view of the 2026 Weekend of Science. Vera de Kok / Wikimedia Commons (CC BY-SA 4.0). EXIF orientation respected, cropped to the upper 55% and converted to WebP; colours and contrast unchanged, same licence. Wikimedia Commons · CC BY-SA 4.0
The radio telescope in Dwingeloo. Archive photograph, May 2022; not a view of the 2026 open day.
The radio telescope in Dwingeloo. Archive photograph, May 2022; not a view of the 2026 open day. HarmMunk / Wikimedia Commons (CC BY-SA 4.0). Resized and converted to WebP; same licence. Wikimedia Commons · CC BY-SA 4.0

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