[no-to-illegals]

What if, in the plane, the geometry is such that there is no opportunity to form a straight line where the communication can arrive unobstructed? A heavenly body gets in the way or the communication is obstructed because of another event where no stability of the communication line is possible either due to an obstruction or unacceptable geometric planes.

[Windflier]

What if, in the plane, the geometry is such that there is no opportunity to form a straight line where the communication can arrive unobstructed? A heavenly body gets in the way or the communication is obstructed because of another event where no stability of the communication line is possible either due to an obstruction or unacceptable geometric planes.

Well, think about our primitive radio technology. It goes through walls, buildings, clouds, storms, metal car bodies, etc. I would think that a sufficiently advanced communication technology would have to overcome the obstacles you mentioned. Perhaps through some sort of 'lensing' or 'line bending' feature that we can't quite imagine today.