The diagram shows the field-of-view of a visible telescope in relation to the average
angular distance between solar-type stars out to a distance of 1,000 light years. As can
be seen, this average angular separation is much greater than the FOV of the 128 x 128
photodiode array. Hence, even more so than for infrared observations, it does not make
sense to conduct an "All Sky Survey" in the visible spectrum, since most of the
time the array would just be observing empty space! Note that the array FOV is not drawn
to scale.
