[Space] Making a solar system with 3 (semi-) habitable planets?

[vicky_molokh]

Originally Posted by Anthony

Because the exclusion zone (not the life zone) is the zone where the planet's gravity is sufficient to eject all other objects from its orbit.

Aren't exclusion zones roughly comparable to to Orbit×1.4 and Orbit/1.4? (I.e. vaguely less, such that at a ratio of 1.4 is more-or-less safe from the other orbital body's gravity.) I thought those numbers come from laws of astrophysics, not made up in G:Space. Are they real-life or not?