Howdy, Boris, I have done some of your questions on GravitySimulator about a little less than a year ago.<blockquote><font class="small">In reply to:</font><hr /><p>Solar L4 & L5 are stable but quite a bit further distance. Would the stability factor outweigh the distance & time it would take to get there?<p><hr /></p></p></blockquote>Working with the Sun/Neptune Lagrange points L4 & L5, I can attest that, strange as it may seem, the orbital period of massless test objects which are situated at various distances from the Lagrange point have the same orbital period. Long ago somebody in the Space Studies Institute determined that the orbital period around the Sun/Earth Lagrange points is a little over 700 years. This would be, for example, to get from near L3, assume a higher, slower orbit around the Sun, pass over L4, approach Earth, be pulled into a lower, faster orbit around the Sun, and arrive near (but not at) the L3 point again to start over. That's 700 years; an object in a much tighter orbit around L4 (L5 is the mirror image) would also take a little over 700 years. Sorry I forgot the exact period. You can get there much quicker, of course; just burn a little more rocket fuel. This requires braking when you get to the Lagrange point.<br /><br />Contrary to much popular belief, Lagrange points do not attract material into them. Things have to be <i>put</i> there. Or form there.<blockquote><font class="small">In reply to:</font><hr /><p>The Lunar L points are not stable, but they are much closer. Again, station keeping thrust is not a problem for the ISS, I fail to see why it would be a problem here, & these points are easier to get to & you get the added bonus of a thrust cheat when your ship leaves the Earth Moon system.<p><hr /></p></p></blockquote>Thrust cheat can be gotten from any Lagrange point and is about the same. For the Earth/Moon Lagrange points travel time is not too horrendously long. It is possible to force fly through <i>two</i> Lagrange po