Hi everyone.

If a black hole was in a binary system, I was wondering would the event horizon remain spherical or would it be elongated due to tidal forces.

Can this tell us anything about the internal structure? If it distorts, then internally cannot be a singularity, as a point would not feel tidal forces. If it remains spherical, would this prove a singularity?

Some years ago, LIGO detected two black holes of super-stellar mass merging. Can gravitational waves tell us if the event horizons were distorted in the process?

Many thanks.