How big would the diameter of this be ? Something like 8 light days ?
Sounds about right. Wiki has a correctly scaled picture with the two biggest known black hole event horizons and the solar system:
https://en.wikipedia.org/wiki/TON_618
Event horizon radius would be about roughly 1000 times the distance between Earth/Sun.
The Schwarzschild radius would be approximately 106 billion kilometers or about 7 light days (r = 2GM/c²).
Sounds about right. Wiki has a correctly scaled picture with the two biggest known black hole event horizons and the solar system:
https://en.wikipedia.org/wiki/TON_618
Event horizon radius would be about roughly 1000 times the distance between Earth/Sun.
The Schwarzschild radius would be approximately 106 billion kilometers or about 7 light days (r = 2GM/c²).