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accretion discs

emptiness

chaos.

Earth

And eventually those two independent black holes with their accretion discs will spiral together and merge themselves and form an even more massive black hole.
Two possible fates await us. If we are on one side of the galaxy when this clash happens, we could be thrown out into the emptiness of space if we are lucky.
The second possibility is that we're on the other side of the galaxy at the time of the collision in which case we could be thrown right into the center of this chaos.
In the active center of the merging galaxy, the huge feeding black hole will trigger a giant stellar explosions and supernovae. This is bad news for Earth.
There could be a horrible catastrophe. The wave of radiation from the blast wave of the supernova would hit the atmosphere and boil it off in an instant. So the atmosphere would be gone, the seas would boil off into space and the Earth would be toast.

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