Quote from: Bla on May 04, 2011, 09:35:13 AM Black holes in Universe Sandbox are like all other bodies. I hope what I wrote is correct and useful. But because the black hole is much smaller, if a body gets within what would've been the surface of the old star, the gravitational force on that body will be bigger, eventually reaching the point where light can't escape if it gets as close as the surface of the black hole. If you turn a star into a black hole, with the same mass, it will not have any effect on any orbits. The gravity is dependent on how big the mass is and how far away from it you are. In reality, gravity is a force caused by mass, and it doesn't matter whether the mass is a black hole, star or planet. If the combine mode is selected, they will combine (like what I think you're imagining should happen), if bounch mode is enabled they will simply bounch off each other. Universe Sandbox doesn't make the colission with black holes any different than other bodies in the simulation, either.
The objects which pass close by will probably be slingshot away, and this doesn't have to be because the time step is too high. This results in the size of bodies being much more compact, and thus much harder to hit. The only difference is that their density is set so that light cannot escape from its surface. I hope this helped, i'm sure someone will correct me if i'm wrong!īlack holes in Universe Sandbox are like all other bodies. i'm not 100% sure about in reality, i'm no expert). The only difference with a black hole is that at its surface the gravity is so intense that light cannot escape, at long ranges it is equivalent to a star (from Newtonian Physics anyway.
It's still possible for objects to orbit a black hole as they do a star, and even for black holes to orbit stars or even planets. they pass too close or don't have enough speed. The black hole will eat any objects that collide with it, i.e. It may also be worth enabling RK4 if you can. This is to do with how the RK4 method (or euler) simulates the system.
If the time-step is too large, the calculations can't simulate a close pass-by well and it causes the object to shoot away from the star. If objects are getting slingshotted out of the system, it may because they are passing in a tight eliptical orbit. Providing you don't change the mass the planets shouldn't change their paths at all.
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