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The Big Bang Theory
Not this one…
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The Theory• The Big Bang describes how:– a massive explosion created
the universe –the cooling and expansion of
the universe could have made stars & galaxies
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What Happened…• The universe began in an instant billions of
years ago (~13.7) during an enormous explosion• Over time the universe cooled atoms formed• Gravity pulled atoms together into gas clouds
* When our solar system formed the universe was smaller (2/3 to be exact)
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Evidence: Red Shift• Discovered by Edwin Hubble (1929)• The light from other galaxies is becoming
more red in color (the waves are moving slower)
• Supports the idea that the universe is expanding causes galaxies to spread apart
• Hubble’s Law- the speed at which a galaxy moves away from Earth is proportional to its distance from Earth
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Evidence: Microwave Background Radiation
• Discovered by American physicists Penzias & Wilson (1965) in New Jersey
• Is a faint and distant glow of energy that was produced in the big bang and continues to move through the universe
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