There is no stealth in space. Therefore, instead of hiding, the aliens are going to pro-actively fry every competitor civilization by using their solar shades

There is no stealth in space. Therefore, instead of hiding, the aliens are going to pro-actively fry every competitor civilization by using their solar shades as a Nicoll Dyson Beam... :-) https://www.youtube.com/watch?v=RjtFnWh53z0 https://www.youtube.com/watch?v=RjtFnWh53z0