Quote:
Originally Posted by Varyon
For the point where Warp drives start functioning, I can think of three big ones - the snow line, the outer limit radius, and the heliopause. The snow line is the point at which water ice would have been present during formation. The outer limit radius is the furthest out a planet could have formed, and serves as a decent "you are now exiting/entering the solar system" guidepost. The heliopause is where the solar wind created by the sun is unable to push back the interstellar medium, and is another good point to place the boundary of the solar system (and the one I opted for with my Harpyias setting). There isn't anything specifically alchemical here, but you can probably come up with such concepts (particularly for the snow line and heliopause). The snow line and outer limit radius you can calculate using the star system design sequence from GURPS Space, but I never found a way to determine the heliopause.
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I agree with Fred's choosing the Heliopause. It has the most Alchemical feel. Thanks for telling me about it.