  We show that space-based telescopes such as the proposed Terrestrial Planet
Finder Coronagraph will be able to detect the light scattered by the
interstellar grains along lines of sight passing near stars in our Galaxy. The
relative flux of the scattered light within one arcsecond of a star at 100 pc
in a uniform interstellar medium of 0.1 H atoms cm^-3 is about 10^-7. The halo
increases in strength with the distance to the star and is unlikely to limit
the coronagraphic detection of planets around the nearest stars. Grains passing
within 100 AU of Sun-like stars are deflected by radiation, gravity and
magnetic forces, leading to features in the scattered light that can
potentially reveal the strength of the stellar wind, the orientation of the
stellar magnetic field and the relative motion between the star and the
surrounding interstellar medium.
