As long as you’re not too needy, there are many interesting smaller systems that can be simulated much faster. US2 tries to configure simulation settings on the fly for the optimal experience, but do not expect to accurately predict how 2 thousand mutually interacting planets will look 2 million years into the future. Unfortunately, the amount of calculations increases exponentially, as you add more bodies to simulate.
These laws discovered over 300 years ago are good enough to describe most normal astronomical interactions with decent precision, as long as you can properly calculate the results. The main (and the oldest) feature of Universe Sandbox 2 is the simulation of Newtonian gravity. Fortunately for the amateur astrophysicists, Universe Sandbox 2 gives an opportunity to simulate a wide variety of astronomical events in a much more accessible way. Actual scientific simulations are often quite complex, require a lot of computational power and are hard to grasp without the years of specialized study. Programming computers to solve physical equations and giving it a starting point, allows us to predict how planets and stars will behave millions and billions of years into the future. We can either try to observe what is already there or use our knowledge of physics to calculate how the heavens should behave.
Astrophysics is an area of science, where it is impossible to set up experiments due to the enormous spatial and temporal scales involved.
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