Red shift

• how to know when the light from distant galaxy?

  all the lines have shifted towards the red end of the spectrum (right)
• what is the purpose of the red shift?

  galaxies are moving away from each other
• galaxies that are further away have a bigger red shift so these galaxies are moving faster than galaxies that are closer
• what are nearby galaxies?

  have a small redshift, showing they are moving away
• what are distant galaxies?

  have large redshift= showing they are moving away faster
• what are very distant galaxies?

  have a very large redshift, moving away really fast
• what is the bigbang?

  universe began from a very small region that was extremely hot and dense
• 2 things scientists cannot explain?

  dark matter and dark energy