Bad day? Any inhabitants of the galaxy pictured are getting a worse one. A black hole the size of a solar system is barrelling through it at 2000 km/s - far faster than any space ship.
How? Huge black holes result from smaller holes merging. This merger gave off massive gravitational waves, equivalent to 100 million supernova - hurling the monster hole through space.
Worlds caught in its path wouldn't see darkness approaching though - the hole's dragging clouds of superheated gas along. Instead the sky would get brighter and hotter until the very rocks boiled.
Not much better IMHO...
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