Re: Stars (was: RE: [OFFICIAL] Background thoughts(Size of Human Space))

Bradford Holden writes:

@:) To continue this completely off-topic discussion....

  It's better than some recent discussions.

@:) I just looked it up, there are 6,300 or so F and G type stars in
@:) the solar neighborhood for every 10^6 pc^3, so it works out there
@:) should be 6,100 or so in a sphere of 200 ly centered on the earth.
@:) For stars that are close to the sun in surface temperature and
@:) total luminosity, you might want to cut that number down by a
@:) factor of 5 or so.

  Using an on-line reference of nearby stars, the same one mentioned
by Tre, I think, I found 670 G, low-numbered F, or high-numbered K
stars within 25 parsecs (81.5 ly).  That sounds like about 1158 within
100 ly.  Choose your own likelihood of planets but it sounds like a
relatively large number of systems.  The reference is:

  Cat.of Nearby Stars,3rd Ed.(prelim.) (CNS3) Gliese,Jahreiss,1991,

  and I found it at:

  http://adac.mtk.nao.ac.jp/index.html.

  Thanks to Mark K. for astronomical assistance.

-joachim