_____ 8. Which of the following elements
belong to the group?
_____ 10. How Elements heavier than iron are formed?
a. big bang nucleosynthesis
c. stellar nucleosynthesis
b. solar nucleosynthesis
d. supernova nucleosynthesis
_____ 11. Which element will be formed when Carbon atom is combined with Helium atom?
_____ 12. Why do average stars have longer life span than massive star?
_____ 13. Which phase of star life cycle is our sun?
_____ 14. Which of the following contains only heavy elements?
a. carbon, lithium, neon
c. carbon, beryllium, helium
b. carbon, silicon, magnesium
d. helium, carbon, hydrogen
15. In which stage do massive stars explode and release large amount of energy?
Stellar Nucleosynthesis: Rise of the
The world where we live today is just a small part of our universe. In your previous years, you have
learned about the different theories of the origin of the universe that eventually led to the formation of
galaxies, solar system and other heavenly bodies. This lesson will focus on one of those wonderful
things present in outer space, the stars. Although stars are millions of light years away from us, we can
still see them twinkling in the night sky. Let’s find out how they emit light and what keeps them shining
for a long time.
Scientists believe that the formation of the universe began through the explosion of a primordial atom
which happened 13 billion years ago. It is known as the Big Bang. It became a theory that also explains
the continuous expansion of the universe.
2 | EARTH and LIFE SCIENCE