In our simulations, we find it overwhelmingly likely that any such spherical volume of an alien civ would be much larger than the full moon in the sky. So no need to study distant galaxies in fine detail; look for huge spheres in the sky.
In our simulations, we find it overwhelmingly likely that any such spherical volume of an alien civ would be much larger than the full moon in the sky. So no need to study distant galaxies in fine detail; look for huge spheres in the sky.