Observatoire de Paris
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Planet researchers need tools :

Planet research requires working in shifts, and the researchers come from varied backgrounds. They have to define which units they will use to quantify what is measured. A common language is necessary : these are the mathematical notations.

The mechanisms studied in the Solar System are useful to know, because the same rules also apply to exoplanets, planet mechanics, the Roche limit, and resonances.

To venture outside the Solar System, we have to know the "laws of the environment", the environment being the Universe : theforces at stake, and the states of the matter. How does a planet/star form? Why does it shine as a black body ? How can its light be analysed to detect the signatures of atoms and molecules?

Finally, we use tricks in research because the extrasolar planets are hidden by their larger and brighter stars, the barycenter, and theDoppler effect.