red shift

Cards (9)

what is the red-shift effect?
observed increase in the wavelength of light from distant galaxies
what does red-shift prove evidence for?
expansion of the universe
Big Bang theory
the further away the galaxies, the faster they're moving & the bigger the observed increase in wavelength
what does the Big Bang theory suggest?
the universe began from a very small, hot & dense region
how does red shift support the Big Bang theory?
furthest galaxies show the biggest red shift
meaning that the furthest galaxies are moving fastest
so the Universe is expanding
this suggests that the Universe started from an initial point
what do 1998 observations of supernovae suggest?
distant galaxies are receding ever faster
what piece of evidence other than red shift supports the Big Bang theory?
cosmic microwave background radiation
how would the wavelength & frequency of a galaxy moving towards Earth change when viewed from Earth?
wavelength will seem to decrease
frequency will seem to increase
what is cosmic microwave background radiation?
radiation left over from the Big Bang, wavelength has been stretched due to the universe expanding