Life of Stars

1. LIFE OF STARS
By Juan Rodríguez and Jose Vera

2. Index
• Clasification of stars.......................3
• Birth of stars.....................................4
• Live of stars......................................6
• Death of stars...................................10

3. Types of stars

4. Birth of stars
• A nebula contracts and forms a protostar.
• The protostar becomes a star.

6. Main sequence
• It‘s the larger period about 90 % of stars
lifetime.

7. Giant star
• In this stage the star starts fusing helium into
oxygen and carbon.
• Its size is normally 100 times its size in main
sequence.

8. Supergiant stars
• In this stage stars creates the rest of the
elements until nickel.
• Only stars with, at least, 8 times the mass of
the Sun reach this phase.

10. Planetary nebula
• At the end of a giant star strong stellar winds
speel its outer layer to the space.

11. White dwarf
• Is the residual nucleus of the star after the
explosion.
• It does not performe nuclear reactions.

12. Supernova
• The nucleus collapse and explodes.
• Here are produced the rest of the elements.
• They are streamly bright.

13. Black hole
• After the supernova the remaining nucleus of the
start collapse and forms a black hole.
• It occurs when the remaining nucleus hae more
than 3 times the mass of the Sun

14. Neutron star
• If the remaining nucleus have got less than 3
times the mass of the Sun.
• It‘s extremelly dense.

15. Bibliography
• https://map.gsfc.nasa.gov/universe/rel_stars.htm
l
• https://www.nasa.gov/audience/forstudents/9-
12/features/stellar_evol_feat_912.html
• http://solarviews.com/eng/starformation.htm
• http://www.astronomynotes.com/evolutn/chind
exb.htm
• www.universetoday.com
• oneminuteastronomer.com