"Their average lifespan is about a day: my instruments tell me the one I came through has more than a quarter of its lifespan left, but less than three-quarters. The fact that it's bridged to by a wormhole at all suggests that there will be more, though. I haven't scanned the system thoroughly enough to know which of these anomalies my computer's reporting might be a wormhole, but I would bet you a decent number of ISK that the one I came through isn't the only one in-system."