Would you just shut up and derive?    ;^)

Well... here's what I'm deriving at... after hours of lugubriating...


200 Billion (star systems in the Milky May) divided by 187,346 (we are supposing that one star system for every 187,346 star systems actually sustain life) gives us a grand total of 1,067,543.5 (One Million sixty seven thousand five hundred and forty three and a half star systems that by our *totally unsubstantiated estimate* support life in the Milky Way)

If the 'solar system' is 2 millimeters wide in relation to a Milky Way that is scaled to eighty miles in diameter, then in a twenty mile wide Milky Way, our solar system would a mere half of a millimeter from end to end.

1,067,543.5 ...    times    one half ...   equals    553,717.75 millimeters

...over 1/2 a kilometer.

...or about 1/3 of a mile.

...In a Milky Way of twenty miles in length.
ttr