Astronomical Distance Determination in the Space Age. Secondary distance
  indicators
  The formal division of the distance indicators into primary and secondary
leads to difficulties in description of methods which can actually be used in
two ways: with, and without the support of the other methods for scaling. Thus
instead of concentrating on the scaling requirement we concentrate on all
methods of distance determination to extragalactic sources which are
designated, at least formally, to use for individual sources. Among those, the
Supernovae Ia is clearly the leader due to its enormous success in
determination of the expansion rate of the Universe. However, new methods are
rapidly developing, and there is also a progress in more traditional methods.
We give a general overview of the methods but we mostly concentrate on the most
recent developments in each field, and future expectations.
