19. Alien Megastructures Around Stars
Some astronomers scan the skies for alien megastructures—vast constructions like Dyson spheres that could surround stars. KIC 8462852, also known as Tabby’s Star, exhibits strange, irregular dimming that sparked speculation about advanced civilizations at work. While most theories point to natural causes, the allure of finding evidence of intelligent life keeps scientists closely watching such enigmatic stars. Read more at The Atlantic.