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I don't think we really need to worry because a tiny black hole approaching a relatively dense area like the solar system would probably pick up quite a lot of stray material in the form of gas and dust in its passage through the Oort cloud this would probably make it visible and would also put off the day of its demise. As the article suggests it would have to be quite close to the earth (within the distance from the earth to the sun. before the explosion represented a significant risk to life.