Since we know that stars are excellent at being seen from very far
away, would a civilization slightly more advanced use some kind of
modulation on their star to send a message out?

While this may seem silly, as even a 10km x 10km shutter is very tiny
relative to the size and surface area of our star, what size would be
needed to be easily detected from afar?

We are already measuring the 'wobble' of stars to infer a planets
existance, could a toggling of the stars brightness, albeit a tiny
one, or one in only a narrow frequency band, be a more effective means
of transmission, given that effective is partially defined as 'easily'
seen/interpreted?

Eric Albers

e r i c at ericalbers dot com