Distance Ladder

The series of techniques employed by astronomers to obtain distances to progressively more distant astronomical objects.

The Distance Ladder

Object Distance (pc) Method
Sun, Solar System 10-6 Radar, Orbits
Alpha Centari 1 parallax
Hyades Cluster 40 Hipparcos parallax
Galaxy 104 Cepheids, Main Sequence Fitting
Andromeda 105 Cepheids, Supernovae, OB stars
Virgo Cluster 107 HST Cepheids, OB stars, SN
Beyond 108 and up Brightest Galaxies, Tully-Fisher