Red-Shift

• How does redshift provide evidence for the Big Bang theory?

  It shows galaxies are moving away from each other
• What is the Milky Way galaxy part of?

  The universe
• What did astronomers detect about light from distant galaxies in the 1900s?

  It has an increased wavelength
• What happens when light from the Sun is passed through a prism?

  A spectrum is produced
• Why are there dark lines in the spectrum of sunlight?

  Elements in the Sun absorb specific wavelengths
• What is the term used for the shift of light towards the red end of the spectrum?

  Redshift
• What does redshift indicate about galaxies?

  They are moving away from each other
• How does the redshift differ between nearby and distant galaxies?

  Distant galaxies have a larger redshift
• What does a larger redshift imply about a galaxy's speed?

  The galaxy is moving away faster
• What does the fact that distant galaxies are moving faster than nearby galaxies suggest?

  The universe is expanding
• What do scientists believe about the origin of the universe?

  It began from a small, hot, dense region
• What theory explains the beginning of the universe?

  The Big Bang Theory
• What did astronomers notice around 1998 regarding the universe's expansion?

  The rate of expansion is increasing
• What did observations of supernovas reveal about the universe's expansion?

  It is expanding faster than expected
• What are dark matter and dark energy theorized to explain?

  The speeding up of the universe's expansion
• What are the key points about redshift and the Big Bang Theory?

  • Redshift indicates galaxies are moving away
  • Distant galaxies have larger redshifts
  • Evidence supports the expanding universe concept
  • The universe began from a hot, dense region
  • The Big Bang Theory explains this origin
• What are the implications of the universe's expansion rate increasing?

  • Expansion is faster than previously thought
  • Challenges existing gravitational models
  • Suggests presence of dark matter and dark energy