CMBR + Redshift

• What phenomenon occurs when light emitted from stars moving away from us increases in wavelength?

  Redshift
• Why do most stars and galaxies appear to have been redshifted?

  Because the universe is expanding
• What is the Doppler effect?

  It is the change in frequency or wavelength of a wave in relation to an observer moving relative to the source of the wave
• What must happen for light to be redshifted?

  Light must hit the receiver before it's redshifted
• What is cosmic microwave background radiation?

  Thermal radiation from the Big Bang
• What do tiny fluctuations in temperature in the cosmic microwave background radiation indicate?

  They support the Big Bang theory
• Why is cosmic microwave background radiation considered strong evidence for the Big Bang theory?

  It shows that the universe is expanding and galaxies are receding
• What does redshift in light from stars indicate about their movement?

  It indicates that they are moving away from us
• What are the implications of redshift in the context of the universe's expansion?

  • Indicates that galaxies are moving away from each other
  • Supports the theory of an expanding universe
  • Provides evidence for the Big Bang theory
• What evidence does cosmic microwave background radiation provide for the Big Bang theory?

  • Thermal radiation from the early universe
  • Fluctuations in temperature support the expansion
  • Best piece of evidence for the Big Bang theory