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NGC5128, aka Centaurus A, is not visible from Britain. I observed it from the Algarve, where it barely creeps above the horizon in May. It was very low over the sea, and very faint. It is a galaxy, but a very odd one. About 10 million light years away, it is a powerful radio source. It is thought to be basically a giant elliptical galaxy, and that the dark dust lane that bisects it may be the remains of a smaller spiral galaxy.