Orbital sciences & Cosmology PDF
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     1) a. "Our Galactic Black Hole :  indirect observation with S2 star and maximum size" http://docdro.id/dbMvJyD  (En PDF)  

         b. "Notre Trou Noir Galactique : observation indirecte (étoile S2) et taille maximum"  http://docdro.id/s6BiUCG (Fr PDF)

   Edited by : Guillaume Mahe, Space Teacher.

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