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In 2012, Voyager 1 crossed the heliopause, becoming the first human-madeobject to exit the solar system. This milestone signifies the beginning of animportant new era for local interstellar medium (LISM) exploration. We presentmeasurements of the structure and composition of the LISM in the immediate pathof the Voyager spacecraft by using high-resolution Hubble Space Telescope (HST)spectra of nearby stars that lie along the same lines of sight. We provide acomprehensive inventory of LISM absorption in the near-ultraviolet (2600-2800Angstroms) and far-ultraviolet (1200-1500 Angstroms). The LISM absorptionprofiles are used to make comparisons between each pair of closely spaced (<15deg) sight lines. With fits to several absorption lines, we make measurementsof the physical properties of the LISM. We estimate electron density along theVoyager 2 sight line, and our values are consistent with recent measurements byVoyager 1. Excess absorption in the HI Ly-alpha line displays the presence ofboth the heliosphere and an astrosphere around GJ 780. This is only the 14thdetection of an astrosphere, and the large mass-loss rate ($\dot{M} =10\dot{M}_\odot$) is consistent with other subgiant stars. The heliosphericabsorption matches the predicted strength for a sight line 58 deg from theupwind direction. As both HST and Voyager reach the end of their lifetimes, wehave the opportunity to synthesize their respective observations, combining insitu measurements with the shortest possible line-of-sight measurements tostudy the Galactic ISM surrounding the Sun.

Measuring the Local ISM along the Sight Lines of the Two Voyager Spacecraft with HST/STIS