The Serenus Galaxy is a barred spiral, with long trailing arms. There are around 600 million stars within it.
At its centre is a body of great gravitational force, but not a conventional black hole. It appears to be some kind of extreme interaction between universes, emitting light and producing a strong magnetic field.
Like the rest of Tranquil, the stars and planets here never age. Worlds of note are:
Notable species from Serenus include the: