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 are elements moving rapidly through our galaxy.
( z1 move :ARG1 ( z2 element ) :ARG2 ( z3 galaxy :poss ( z4 we ) ) :manner ( z5 rapid ) )