[PvK]

Ya, "None" does not equal "Any", which could be another type, but isn't in SE4. I know at least one game that did have an "Any" type, but it cost balance points to take that, naturally.

Of course, the pressure considerations, and others (mixture, temperature, radiation, etc) would realistically be almost all wrong on all non-native worlds. The typical Sci Fi handwave "Hmm, looks like Earth-like conditions on that random planet we just happen to be flying by..." would be ridiculously rare, unless the planets were terraformed somehow...

PvK