Two astrophysicists from the Geneva Observatory (attached to the University of Geneva and the Federal Institute of Technology) have succeeded for the first time in accurately detecting the sound of a star other than the sun. François Bouchy and Fabien Carrier measured the speed variations of Alpha Cen A, the most brilliant star in the Centaur constellation, from the European Southern Observatory at La Silla in Chile.

The measuring instrument used, the Coralie spectograph mounted on the Leonard Euler telescope, was developed in Geneva. The information gathered will help astrophysicists understand the internal properties of the stars and thus to learn more about the matter that surrounds us.

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