2. OBJECTIVES
At the end of this presentation, you are expected to:
● give evidence for and describe the formation of
heavier elements during star formation and
evolution (S11/12PS-IIIb-10).
● explain stellar nucleosynthesis; and
● describe the different stages of life cycle of stars.
3. GAME: PICTURE ZOOM
Instruction: Name the thing shown in the
picture. Pictures are zoomed in at the first
part then continues to zoom out if a TEAM
passes or guessed it wrong. The team may
opt to choose if they will play the round first
or the opposing team will guess first. The
team who gets the highest score wins!
33. Scientists believe that the formation of the
universe began through the explosion of a
primordial atom which happened 13 billion
years ago.
Right after Big Bang, protons and neutrons
combined together and formed light elements
Hydrogen and Helium in the process of Big
Bang Nucleosynthesis. Other light elements
such as Lithium and Beryllium were also
formed during this process.
38. “Stellar” means star and the formation of
elements in the center of the star is called
39.
40.
41. • All stars produce helium.
• Stars over a certain mass threshold
produce carbon, nitrogen, oxygen, and
lots of heavier elements.
• The formation of elements in the center of
the star is called stellar nucleosynthesis.
• Explosion of star or supernova releases
large amount of energy. Because of that,
elements are dispersed into the space.
