space phys

• evidence of big bang - red shift

  • distant galaxy more red shift -> recede faster than near ones
  • space expansion: all distance larger at same rate
  • universe expand from one point
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  CMBR- cosmic microw bg radiation

  • leftover radiation from explosion
  • Observed at all points in space around us
  • originally higher E: high frequency EM
  • space expand -> wave length expand, f decrease -> microwave region