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<-   The interior of the stars   ->
figures/coupedusoleil.jpg
The interior of our star, the Sun
Crédit : Paris Observatory / UFE

The stars are huge gas spheres (mainly made up of hydrogen and helium).

The physical conditions (temperature, pressure, density) are highly varied from the surface to the core, and from a star to another.

The physical processes are various and come from various fields of Physics (nuclear reactions, interactions matter-radiation, hydrodynamics, ...). The stars allow us to study these processes with physical conditions inaccessible to laboratories.

The structure of the stars and their evolution are imposed by these physical processes.