Share lang po. :)

1. The Formation of
in the Big Bang Theory

2. What is
Big Bang Theory?

3. theory (n.)
• an idea of or belief about
something arrived through
speculation or conjecture;
• a scientific principle to explain a
phenomena

4. • The Big Bang Theory proposes that
the universe was once extremely
compact/dense, and hot.
• A cosmic explosion (the Big Bang)
occurred about 13.7 billion years
ago, and the universe has been
expanding and cooling.

5. What are the light elements in the
universe?

6. • Hydrogen (found in the sun and
most the stars)
• Helium (usually used to inflate
balloons)
• Lithium (usually found in batteries)
• Beryllium (usually found in aircraft
components, missiles, aircraft, and
satellites)

7. How were the light elements formed in
the Big Bang?

8. According to the Big Bang Theory,
the universe began from a tiny,
extremely dense and hot energy
that expanded explosively.

9. Some of the energy condensed
into quarks that then combine to
form protons and neutrons as the
universe continued to cool.

10. After one second, the protons and
neutron existed in a ratio of about
6 to 1, and conditions allowed the
particles to combine as nuclei,
beginning the era of Big Bang
nucleosynthesis.

11. For a period of about 1,000 seconds,
the lightest elements could form
everywhere in the universe. As the
universe continued to rapidly cool and
expand, the density dropped into a
point where protons and neutrons no
longer combined into nuclei. Big Bang
nucleosynthesis stopped.

12. At the end of this period of nucleosynthesis,
hydrogen (1 proton) made up close to 75
percent of the ordinary matter in the universe by
mass, deuterium (hydrogen isotope with 1 proton
and 1 neutron in the nucleus) about 0.001
percent isotopes of helium (2 protons) close to
25 percent, and the isotopes of lithium (3
protons) a tiny trace. A very small amount of
beryllium (4 protons) isotope may have formed
that later decayed to lithium.

13. • Each of these nuclei had a
positive charge.
• They could not become atoms
until the universe had cooled
enough that negatively charged
electrons could stably combine
with nuclei.

15. • Hydrogen began to form atoms
about 300,000 years after the
era of nucleosynthesis.
• The formation of the first atoms
was complete about one million
years after the big bang.

16. • What is a theory?
• What is Big Bang Theory?
• How were the light elements
formed in Big Bang?
• What are those light elements?

17. On a sheet of paper, compare
and contrast your personal belief
about the beginning/creation of
the universe
to Big Bang Theory.
Present your work with the class.