The QCD axion is a CDM candidate,
despite its meV mass, due to non-thermal
production mechanims. If
the axion is born after inflation,
there are 2 contributions to dark matter:
cold modes from strings, and the
oscillating misalignment
field. This talk is about how the
misalignment axions would appear
today in galactic halos. I recall that the
gravitationally stable QCD-axion field
configuration is the size of an
asteroid, estimate that rotation could
allow it to be an order of magnitude bigger,
explore whether asteroids of axion
dark matter are allowed, and speculate
on how a halo of axion drops might have formed.
