  The nature of dark matter is one of the most pressing questions in particle
physics. Yet all our present knowledge of the dark sector to date comes from
its gravitational interactions with astrophysical systems. Moreover,
astronomical results still have immense potential to constrain the particle
properties of dark matter. We introduce a simple 2D parameter space which
classifies models in terms of a particle physics interaction strength and a
characteristic astrophysical scale on which new physics appears, in order to
facilitate communication between the fields of particle physics and astronomy.
We survey the known astrophysical anomalies that are suggestive of non-trivial
dark matter particle physics, and present a theoretical and observational
program for future astrophysical measurements that will shed light on the
nature of dark matter.
