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.
The milky way produces a very small amount of gas
States the amount continues to grow
( z1 produce :ARG0 ( z2 way :name ( z3 name :op "Milky" :op "Way" ) ) :ARG1 ( z4 gas :quant ( z5 amount :mod ( z6 small :degree ( z7 very ) ) ) ) )