How do galaxies collide in an expanding universe?

25 June 2012

Question

Hi Chris,

I enjoy listening to you here in South Africa, on Redi's Friday show. If I may ask; I have read several articles forecasting the "imminent" collision of our Milky Way galaxy with that ofAndromeda. I've never been able to understand how galaxies can collide in an expanding universe when everything is diverging at great speed. Can you help explain?

Kind Regards, Brian

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