• The resolution of this image taken on 2 July 2012 enables us to see numerous details in the sunspots as well as the granulation that forms a genuine mosaic on the surface of the Sun. These granules make it possible to remove heat towards the surface. © E. Beaudoin-Ciel et Espace
  • The Coelosat incorporated into the roof of the Palais de la Découverte, allows us to observe and study the Sun by projection, by means of two mirrors that reflect the image of the Sun into a refracting telescope. © C. Rousselin-EPPDCSI
  • A gigantic sunspot visible in the lower portion of the Sun, and photographed on 23 October 2014 by the Solar Dynamics Observatory (NASA). This observatory is a satellite that has been orbiting the Earth since February 2010 and that monitors solar activity. Ten Earths could be lined up within the length of the sunspot. © NASA/SDO
  • The resolution of this image taken on 2 July 2012 enables us to see numerous details in the sunspots as well as the granulation that forms a genuine mosaic on the surface of the Sun. These granules make it possible to remove heat towards the surface. © E. Beaudoin-Ciel et Espace
  • The Coelosat incorporated into the roof of the Palais de la Découverte, allows us to observe and study the Sun by projection, by means of two mirrors that reflect the image of the Sun into a refracting telescope. © C. Rousselin-EPPDCSI
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Sébastien Fontaine, Head of the Astronomy Unit presents the coelostat, an instrument that has been incorporated into the roof of the Palais de la Découverte since it opened in 1937, and that enables us to observe and study the Sun.

Audioguide for all ages, from 12 upwards.

The coelostat of the Palais de la Découverte

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