[yendu bwam]

Quite possibly for the same reason that we aren't spread out all over the galaxy ourselves. The speed of light limit, and the enormous energies or time needed to traverse the galaxy put an enormous barrier to its exploration. Those barriers may be untranscendable, making them as difficult for others as they are for us.

Understanding and harnessing Zero Point energy and the related physics will overcome those limitations.

Well, that's possible. But there really isn't much evidence to reach that conclusion - at least not yet!

[Quix]

But there really isn't much evidence to reach that conclusion - at least not yet!

I think that depends on where one looks with what kind of blinders and assumptions. From my layman's perspective, there appears to be, for initial stages, a surprising amount of surprisingly quality evidence . . . if one looks carefully and resourcefully enough.