SJ: "Astronomers believe that in the past our own galaxy may have had an
active black hole at its core. Although it is still there, it is not now being
fuelled by a giant accretion disk. Lucky for us. If it was, then the high-
energy radiation from it might make life very difficult indeed."
SJ : This yet more evidence for the fine-tuning design argument in respect of life
on Earth and against the SETI assumption that life in the universe is
common.
So you have established that life started on earth because the conditions were right. Now what evidence is there that the conditions were made to be right for life to start on earth? The 'fine tuning' design argument, like so many design arguments is severely lacking in any supporting data.