What is the Big Bang Theory?

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What is the Big Bang Theory?
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Balloon Demonstration

• 1. Partially inflate a balloon. Twist the
  opening and hold it shut.
• 2. Draw and label four squares A,B,C, D on the
  balloon. Measure the distance between the
  squares. Record the data.
• 3. Inflate the balloon to its fullest capacity.
  Repeat your measurements.

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Balloon Demonstration

• What happened to the distances between the dots
  as you inflated the balloon?
• Did some of the dots move farther apart than
  others? Why?
• Suppose the balloon represents the universe. How
  does this activity show what is happening to the
  universe and to the galaxies in it?

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Whats in a universe?

• A universe contains
• the Earth and everything on it.
• It also contains everything in
• the solar system.
• All stars, of which the Sun is
• one, are part of the universe.

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Astronomers Think

• They believe the universe was created 10-15
  billion years ago.
• Billions of years ago, the Universe was very
  small. (Ten times smaller than a dot you make on
  a piece of paper with your pencil)
• All the matter in space was compacted into a tiny
  dot called a SINGULARITY.
• A huge explosion, referred to by astronomers as
  the Big Bang, sent the entire universe flying out
  at incredible speeds.

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Who created the Big Bang Theory?

• Johannes Kepler

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Astronomers Believe

• Eventually matter cooled and condensed into
  galaxies and stars.
• Planets formed.
• That the universe is still expanding.
• Edwin Hubble supported this
• Theory with his telescope. He
• Observed leftover radiation
• From the explosion and
• Discovered that the universe is expanding

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Astronomers Think

• Astronomers have discovered the outward motion of
  the galaxies have only slowed down a little since
  Big Bang.
• The universe may continue to get Bigger and
  Bigger forever!

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Lets review

• Who created the Big Bang Theory?
• Explain the Big Bang Theory.
• A huge explosion, referred to by astronomers as
  the Big Bang, sent the entire universe flying out
  at incredible speeds. The universe is still
  expanding.