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document updated 16 years ago, on Sep 11, 2008
distance ladder, distance scale

really good explanation

Methods

Units

unit method equivalent
AU 150,000,000 km
ly 63,000 AU
parsec 3.3 ly
z= redshift z has several things that have to be factored out before it can be used as a direct distance
km/s redshift 68.8 - 71.4 mpc, 227 - 235 ly