  A brief illustrative discussion of the shadows of black holes at local and
cosmological distances is presented. Starting from definition of the term and
discussion of recent observations, we then investigate shadows at large,
cosmological distances. On a cosmological scale, the size of shadow observed by
comoving observer is expected to be affected by cosmic expansion. Exact
analytical solution for the shadow angular size of Schwarzschild black hole in
de Sitter universe was found. Additionally, an approximate method was
presented, based on using angular size redshift relation. This approach is
appropriate for general case of any multicomponent universe (with matter,
radiation and dark energy). It was shown, that supermassive black holes at
cosmological distances in universe with matter may give the shadow size
comparable with the shadow size in M87, and in the center of our Galaxy.
