It has indeed been a productive month for black holes. Record setting absolutely huge black holes as big as our solar system has set the record for the largest super massive black hole. But NASA has discovered a black hole that sets a record for another reason. Being one of the smallest ever discovered. Object IGR J17091-3624 is very very small. In fact, it's probably only three times as massive as the Sun! Dangerously close to the lower limit that could for a black hole at all! Any less massive and it would have stopped collapsing well short of becoming a black hole all together.
More information is available on NASA's site.
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