"Are We Invisible to Advanced Civilizations?"
A new paper explores the possibility of advanced civilizations detecting relics of human civilization. Our radio signals, although powerful, would likely only be detectable within a few light years of Earth due to fading power and interference. To detect features like the pyramids of Giza, an optical telescope with a diameter larger than Saturn's orbit would be needed, which is currently beyond our technological capabilities. However, a Type II civilization could potentially detect our great works within 3,000 light years, while it may take thousands of years for us to reach a level where we can see them in return.