Gas flows play crucial roles in galaxy evolution. Inflowing gas provides fuel for star formation, whereas outflowing gas carries away the products of earlier generations of stars. In the Milky Way, we have a front-row seat for viewing the multi-phase gas flows that circulate material from the disk to the halo and back. I will focus on two prominent examples of gas flows: the Fermi Bubbles, a giant pair of outflowing lobes surrounding the Galactic Center, and the Magellanic Stream, an interwoven tail of filaments trailing the Magellanic Clouds as they orbit the Milky Way. I will discuss recent ultraviolet observations from the Hubble Space Telescope, which have provided new insight into the origin of the Fermi Bubbles and the Magellanic Stream. These observations have helped reveal the mechanisms by which the Milky Way exchanges mass with its surroundings and fuels its ongoing star formation.
1) The Magellanic Stream: Circumnavigating the Galaxy
2) Probing the Fermi Bubbles in Ultraviolet Absorption: A Spectroscopic Signature of the Milky Way's Biconical Nuclear Outflow