Newslink: As Much as Half of the Milky Way Likely Came From Distant Galaxies

Astronomers looking at how intergalactic gas and dust moves across great distances found that up to half of the matter surrounding us comes from galaxies far, far away.

https://www.space.com/37660-as-much-as-half-of-the-milky-way-likely-came-from-distant-galaxies.html