history of the universe

The reionisation of the primordial universe

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The reionization of the primordial universe is a crucial step in cosmic evolution that occurs after the Dark Age, a period during which the cosmic atmosphere was dominated by opaque neutral hydrogen. This phenomenon reflects the gradual transition of this dark universe to a lit and ionized environment through the emergence of the first stars … Read more

Globular clusters: relics of the galactic past

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Les amas globulaires : reliques du passé galactique

IN SHORT Globular clusters: groupings of old and dense stars. Considered as ancient relics of galaxy formation. Orbit around the galactic center at distances of 40 to 100 kiloparsecs. The study of globular clusters has helped to better understand the history of the Milky Way. The existence of dwarf galaxies absorbed into our galaxy explained … Read more