The reason we haven’t heard from aliens could be remarkably simple: interstellar communication is hard, and turbulent plasma ...

"You wouldn't need extra effort to look for these technosignatures, if your telescope is already characterizing the planet for other reasons — and it would be jaw-droppingly amazing to find them." ...

Until someone invents warp drive, the only way we can inspect distant exoplanets is with a powerful telescope. However, even the most capable telescopes can only catch faint glimmers from exoplanets.