The parallax can only be used for things inside this galaxy (and until very recently, only in our immediate vicinity within). It's the very first step outside t

The parallax can only be used for things inside this galaxy (and until very recently, only in our immediate vicinity within). It's the very first step outside the solar system in the cosmic distance ladder. Other methods must be used outside the galaxy. http://en.wikipedia.org/wiki/Cosmic_distance_ladder http://en.wikipedia.org/wiki/Cosmic_distance_ladder