As the title states, how much of our galaxy are we referring to if we speak of a portion "hundreds of star systems" in size? The Orion Arm? The whole quadrant?
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1$\begingroup$ You might have been better off posting this on Astronomy. But, I already posted the answer too. $\endgroup$ – JDługosz Feb 2 '17 at 8:31
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1$\begingroup$ @JDługosz Please don't answer and VTC the same question. $\endgroup$ – Frostfyre Feb 2 '17 at 13:00
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$\begingroup$ Well, I ask for purposes of world-building. I got what I needed, thanks! $\endgroup$ – St0necr0w Feb 2 '17 at 15:16
A tiny speck. Maybe 25 light years in radius around us?
See Atlas of the Universe: there are 109 within 20 light years. So use that as an average density, and 40 ly radius would have about 900. Anywhere between 20 and 40 would contain “hundreds”.
There are currently 56 known stars withing 17 light-years from Earth. The Milky Way contains 100 to 400 billion stars; 100 stars is 1 billionth of our galaxy.
It's a house, a small one, on a very small street of a very small village. In a scale of our stellar system. Now you can imagine the scale.