Astro2020: How does dust escape from galaxies?
  Whenever gas is blown out of a galaxy, chances are that it contains some
cosmic dust. This dust is an important part of the metals budget for the
circumgalactic and intergalactic media, and traces the outflow and stripping
history of the galaxy. The dust is also interesting in its own right, as dust
plays an essential role in many astrophysical processes. We have only begun to
learn about circumgalactic dust, and in particular we do not know how (and
when) it escapes its host galaxy. Here we describe the prospects for measuring
the dust mass and properties around many individual galaxies, which will form
the basis for understanding how the dust got there.
