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Q&A What's the latest we would notice the gravitational effects of incoming super massive black hole?

Assuming we are unable to see the black hole via any way such as gravitational lensing, accretion disc or whatever. This is hand wave approach just to make my setting work, due to this answer whic...

3 answers  ·  posted 6y ago by yole‭  ·  last activity 6y ago by yole‭