'ANDROMEDA IS CURRENTLY RUSHING TOWARDS OUR GALAXY AT 120 KILOMETRESPER SECOND IT WILL GRAZE THE MILKY WAY SOME TWO BILLION YEARS FROMNOW, BEFORE EVENTUALLY MERGING THREE BILLION YEARS LATER'

摘要

The reason that both galaxies seem to reach out andgrasp each other before swinging back to eventuallycollide is that although the visible regions of the galaxiesmay not come into contact, the galaxies' large, invisiblehaloes of dark matter do interact with the effect ofdragging the pair back together.