  The recent (apparent) passage of the Voyager 1 spacecraft into interstellar
space provides us with front-row seats to the complex interplay between the
solar wind and the protective surrounding bubble known as heliosphere. The
heliosphere extends radially out to $\sim100$ AU from the sun, and within this
sphere of influence, the solar wind modulates the incoming flux of galactic
cosmic rays (CRs), especially those at low energies. Newly formed stars, which
support both strong magnetic fields and winds, are expected to produce
analogous regions of CR exclusion, perhaps at elevated levels. Such young stars
are encircled by molecular gas-rich disks, and the net removal of CRs from the
circumstellar environment significantly reduces the expected CR ionization rate
in the disk gas, most likely by many orders-of-magnitude. The loss of
ionization reduces disk turbulence, and thereby affects both planet-formation
and active chemical processes in the disk. We present models of CR exclusion
and explore the implications for turbulence and for predicted chemical
abundances. We also discuss means by which ALMA can be used to search for
extrasolar heliosphere-analogs around young stars.
