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Well they said it would take a million years to doube in size, so given that it is 50 million light years away and assuming that this growth is constant (although for it to keep doubling, the growth would have to accelerate exponentially). Does that mean it's doubled in size 50 times? So where ever it is, it may be a super massive black hole by now, even though we only observe it as 30 years old. Plus gravity distorts time so I wonder how that effects how we see black holes and stuff. Gravitational time dilation means that to us as an outside observer of a black hole, the closer something gets to the black hole's event horizon, the slower time appears. So what effect does that have on observations of a black hole forming? Could it really be a few billion years old, but appears as if it's only 30 years because of time, relativity speaking, standing still? My head hurts.