P7 - Distance in Space

P7 - Distance in Space

1. Measuring distance in space

   • Parallax
     • an apparent movement of the stars against the background when the observer changes position.
       • d(pc) = 1/p (arc seconds)
   • Cepheid Variable
     • The longer it's period (slower it's flash) the more LUMINOUS it is.
     • from its period we can tell it's luminosity
       • if a very bright star appear very bright it's close
       • if a very bright star appears to be very dim it's far away.
   • Hubble
     • • to measure the distance of any stars 1 look at the star and find the redshift 2 calculate speed 3 look at the graph or use equation to find distance

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