Quote Originally Posted by Yora View Post
In astronomy, which obviously doesn't apply to Spelljammer, moons orbiting empty space where a planet should be but isn't, would indicate a planet mass black hole. (Which would only be some milimeters in diameter, so basically occupying no space.)
Maybe that's something to work with.
Would that prove to be a navigational hazard? A black hole that size could cause leaky casks in the hold and maybe require patches to the rigging but I don't think it could destroy a ship unless the ship stopped right there and let itself be destroyed. Contact with crew members could be catastrophic on an individual level, but that seems to me to be a really small probability. The level of traffic through the center could skew the odds one way or another, depending. I am definitely putting this on the table for consideration.