Red shift

• What does redshift refer to in astronomy?

  Light shifted towards the red end of the spectrum
• Why does redshift occur?

  Due to the Doppler effect on moving objects
• What happens to light wavelengths when an object moves away?

  They are stretched, appearing redder
• How do astronomers use redshift in cosmology?

  To measure the universe's expansion
• Who discovered the relationship between redshift and galaxy movement?

  Edwin Hubble
• What did Hubble's observations in the 1920s reveal?

  Most galaxies are moving away from us
• What does a greater redshift indicate about a galaxy?

  It is moving away faster from Earth
• How does redshift relate to the Big Bang theory?

  It supports the idea of an expanding universe
• How is redshift quantified?

  As the ratio of change in wavelength to original wavelength
• What does a higher value of redshift indicate?

  Objects are moving away at greater velocity
• How can redshift provide information about quasars?

  By analyzing their light spectrum for properties
• What insights does redshift offer in astrophysics?

  • Dynamics of celestial bodies
  • Expansion of the universe
  • Composition and properties of astronomical objects
• What is the significance of studying redshift?

  It deepens understanding of the cosmos