Fields

Conceptual understanding: modelling gravitational force allows us to predict the circular motion of planets, within the limitations of classical mechanics.

Newton's law is called "The Universal law" which means it applies to the Universe, this is a bold claim. Can we really claim to know that this law applies to every body in the universe?
Use of language: weightless sounds like it means something with no weight but to have no weight you would have to be outside the field. Many people think that there is no gravity outside the atmosphere but this is of course not the case.
It is convenient that matter is made of + and - charge that add and cancel just like numbers. If there had been a 3rd type * and you had to have a +, - and a * to produce a neutral body then we couldn't use numbers to represent them. Is our number system the same as the charges by chance or is there something more deep rooted? Did we come up with the model of charge because our number system works like that or does our number system work like it does because our brains are made of two charges?
The word flux implies that something is flowing. What flows in a magnetic field?
Electric and gravitational forces are very similar, why is the universe so symmetric?
If a "negative mass" existed it would fit nicely into our field model. Does this mean it exists?

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