One of the many mysteries surrounding astrophysical black holes is why some are powering powerful jets - narrow beams of relativistic particles, and others don't. An intriguing possibility is that is related to the spin of the black hole and the surrounding disk of material falling into the black hole - if the two are aligned, you don't get jets, and if they are misaligned, you do. Read here for details. This would be very hard to test, and it isn't clear how you might get such a misalignment, but it is in an intriguing possibility.
Tuesday, July 20, 2010
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