Dyson Spheres, The Ultimate Alien Megastructures, Are Missing From The Galaxy
Ethan Siegel

Consider me as an amateur but please if someone can clarify this :-

Isn't it possible that we are not able to see aliens because what we are looking is past when we look at the space, so suppose we are looking at a galaxy which is millions of light year away from us but now, it must have evolved like how we have evolved in these many years but we can neither visualize nor contact them. And the same maybe possible with aliens too.