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HaveDorothea Klumpke Roberts is part of the Klumpke Sorority. These five sisters, heiresses of Rosa Bonheur, will continue to write the history of the Château de By. Dorothea Klumpke is an astronomer! She spends her life observing the sky, and becomes the first woman to perform a balloon flight, and to lead a section of the Paris Observatory.

On the occasion of the Nuit Des Étoiles, the public is invited to a celestial contemplation in the park of the Château. Thanks to the correspondence and writings discovered in the attics of the Château, the actress Zélie Brault tells us about the life of this great figure of astronomy. She is accompanied on guitar and vocals by the talented Emka.

"Ad Astra" is a pause in the world of lights that accompany us on a daily basis, to look at and become aware of the stars that surround us, plunging us into darkness.