Will Earth Perish by Fire, Ice or Black Hole?

On last night’s news, veteran PBS news anchor Gwen Ifill interviewed a prominent astronomer to solicit comment on the recent discovery of two enormous black holes hiding in the bright central bulges of the giant elliptical galaxies NGC 3842 and NGC 4889. We discuss the time and distance parameters that would be required to make these black holes any conceivable threat to us, concluding, “no can do.” Read the post in Astronomy.

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