Overview and Challenges
The orbits of the planets are open to long-term variations, and modeling the Solar System is subject to the n-body problem.
Read more about this topic: Stability Of The Solar System
Famous quotes containing the word challenges:
“The approval of the public is to be avoided like the plague. It is absolutely essential to keep the public from entering if one wishes to avoid confusion. I must add that the public must be kept panting in expectation at the gate by a system of challenges and provocations.”
—André Breton (1896–1966)