gravity speed exceeding c

[viscious]

during running a simulation i found that the effect of gravity is instantaneous in the program (when i suddenly deleted the sun in the solar system) .. nothing should be able to influence other body over a distance faster than speed of causality ( i.e. c=speed of light)..
Are u modelling the software on purely non-relativistic terms??? If so the gravitational lensing effect of the black holes should not be able to be simulated... Plz clarify...

[DiamondMiner10]

I want to delete the sun and have the earth orbit around nothing for 8 more minutes

[Only2ndplace]

Yeah, the devs said before, that it's a Newtonian gravity animation and to make it relativistic would require tor rewrite pretty much the entire gravitation algorithm.
Body speeds of more than c are also possible in the animation.
I don't know, how they simulate the gravitational lensing and it's true, that this wouldn't happen in Newtonian physics, but my guess is they just modelled it after optical lensing or a some formulas analougous to general relativity.

[Jar]

As mentioned, Universe Sandbox ² is a Newtonian, n-body simulation. We're interested, however, in adding some things which would address a few effects of relativity, such as limiting gravity to the speed of light.

You can learn more in this blog post written by Jenn, our astrophysicist: http://universesandbox.com/blog/2016/02/gravitational-waves/

Hope that helps!