Fact: Black hole bodies absorb matter.
Fact: Each galaxie has a super massive black hole bodie at it's center.
Fact: Galaxies on occassion collide, and absorb each other, forming a larger galaxy.

Assumption: 
When two supermassive black hole bodies meet, it is reasonable to assume they absorb each other, creating a more massive super massive black hole body, with stronger gravity than both had before collision.
Assumpton:
When two similar sized galaxies combine, eventually they must return to the...
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