red-shift

what evidence is there for the expansion of the universe and galaxies moving further away from each other?

• light wavelengths from the most distant galaxies has increased

  • wavelengths are longer

  • red-shift

    • shifted towards the red end of the spectrum

which types of galaxies are moving away faster?

• distant galaxies

  • greater red-shifts than nearer ones

what does it mean if a galaxy is more red-shifted?

moving away faster

how does the Red Shift prove the Big Bang?

• Big Bang was an explosion

  • matter in a dense, hot, small space expanded