What are the most common stars you see at night?

Outside the solar system. There is only one star inside the solar system.

All of the others are outside of it.

With algebraic notation, we are able to derive a rigorous mathematical proof

to substantiate the hypothesis stated above:

Let "N" be the total number of stars. We know from field observation that N>>>2 .

Now, (again from field data), the number of stars within the solar system is equal to '1',

from which it follows that the number of stars outside the solar system is equal to [ N - 1 ].

Since 'N' is a positive integer greater than 2, it is apparent that [ N-1 > 1 ],

whence we may conclude, in Words, that the number of stars outside the solar system

significantly exceeds the number within it.

QED