Molecular clouds contain abundant hydrogen and helium and can become dense enough to collapse under gravity. The collapse forms a rotating gas disk and fragments into cores that further collapse to form protostars. Protostars heat up and stabilize as new stars once hydrogen fusion counters gravitational pressure to form a long-lasting star. The star is then surrounded by a proto-planetary disk that may form planets, completing the process from molecular cloud to star system.

1. From molecular clouds to stars Amaury Thiabaud – M2 A2P – 14/11/2011

2. 1) Requirements : molecular clouds 2) Collapse 3) Nuclear Fire : a star is born From molecular clouds to stars Amaury Thiabaud - English M2 A2P 2 In this talk… Introduction Requirements : molecular clouds Collapse Nuclear fire : a star is born Conclusion In this talk…

11. Introduction Requirements : molecular clouds Collapse Nuclear fire : a star is born Conclusion Conclusion From molecular clouds to stars Amaury Thiabaud - English M2 A2P 11

12. Thank you for your a ttention !