Origin of the Universe
Scientists cannot say where or
how the universe originated.
However, through observations
and exper...
Origin of the Universe
This model is called the big bang
model.
The big bang model explains the
history of the universe fr...
A Model of the Beginning
• According to the big bang
model, 10-20 billion years ago
all matter existed in an
incredibly ho...
A Model of the Beginning
• The first stars consisted
mostly of hydrogen with a
small amount of helium.
• No planets orbite...
A Model of the
Beginning
• More and more stars formed,
matured, and died, making more
and more heavier elements.
• Superno...
A Model of the
Beginning
• Eventually our sun and its nine
planets were formed from
interstellar gas and dust.
Evidence for the
Big Bang Model
• The distance between
galaxies and groups
of galaxies seems to
have increased with time
(...
Evidence
for the
Big Bang
Model
Cosmic background radiation
has been discovered (radiation
left over from the universe’s
b...
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Formation

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Formation

  1. 1. Origin of the Universe Scientists cannot say where or how the universe originated. However, through observations and experiments they have put together a model about how the universe has developed.
  2. 2. Origin of the Universe This model is called the big bang model. The big bang model explains the history of the universe from a tiny fraction of a second after it came into being up to the present time.
  3. 3. A Model of the Beginning • According to the big bang model, 10-20 billion years ago all matter existed in an incredibly hot and dense state. • Matter expanded and cooled, slowly condensing into stars and galaxies.
  4. 4. A Model of the Beginning • The first stars consisted mostly of hydrogen with a small amount of helium. • No planets orbited yet, heavier elements did not yet exist.
  5. 5. A Model of the Beginning • More and more stars formed, matured, and died, making more and more heavier elements. • Supernovas and dying red giants released the heavier elements into space.
  6. 6. A Model of the Beginning • Eventually our sun and its nine planets were formed from interstellar gas and dust.
  7. 7. Evidence for the Big Bang Model • The distance between galaxies and groups of galaxies seems to have increased with time (Edwin Hubble found redshifts in galaxies he studied).
  8. 8. Evidence for the Big Bang Model Cosmic background radiation has been discovered (radiation left over from the universe’s beginning).

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