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.
There is evidence for the gas accretion occurring in the Milky Way.
( z1 evidence :ARG1 ( z2 accretion :mod ( z3 gas ) :location ( z4 galaxy :name ( z5 name :op "Milky" :op "Way" ) ) ) )