The evidence for the continuing accretion of gas by the Milky Way involves high-velocity clouds, or HVCs--mysterious clumps of hydrogen, moving rapidly through the outer regions of the galaxy.
Gas will not continue to escape from our galaxy.
( z1 continue :polarity - :ARG0 ( z2 gas ) :ARG1 ( z3 escape :ARG0 z2 :ARG1 ( z4 galaxy :poss ( z5 we ) ) ) )