Also called celestial mechanics. This is from NASA STI, its an introduction to the subject.
The essay is not easy to write and likely won't be easy to understand if one is averse to facts. Ever since Sir Isaac got beaned by a golden delicious, the world became aware of Gravity. Gravity seems to be acting on everything and everyone on earth--except one Jeffrey Epstein, now allegedly deceased. Perhaps Mr. Epstein learned to overcome the laws of physics by consulting Stephen Hawking. For it seems to be almost a physical impossibility for Mr. E.
This is what der wiki calls a stub, or what I think of as a snippet. It is not to be fleshed out and finished off by further written expansion of the core article, however, but by cognition, internalization and apperception. Which is not to say that commentary isn't waranted and even solicited.
Don't worry, this article will not be filled with wonderful mathematic formulas, but is to be inferred in a perhaps allegorical way.
The source of this essay is the following article:
Scientists unveil new form of matter: Time crystals
By Robert Sanders, UC Berkeley Monday, January 30, 2017
What gets us into trouble is not what we don't know.
It's what we know for sure that just ain't so.- - Samuel Langhorne Clemens, AKA Mark Twain
Taking a break from my HDS (Hillary Derangement Syndrome--where I search the web relentlessly to find negative articles on HRC to justify my feelings about her) I came across this incredibly important advancement in cleaning up one of the giant messes that the FFI (Fossil Fuel Industry) like to make, quite regularly.
This video highlights, in my mind, why it's important to fund "basic scientific research."
So, this is just my personal philosophical take on it, but IMHO the basic Newtonian laws of physics apply to political action.