Have They Seen Us?

The video explores the possibility of alien civilizations detecting Earth's radio signals, which have been expanding into space for over a century. It discusses the efforts of SETI to find extraterrestrial intelligence and the challenges faced in detecting alien signals due to frequency overlaps and radio leakage. The video introduces the concept of interferometry and the Square Kilometre Array (SKA), a powerful radio telescope array that could potentially detect alien TV signals. However, the SKA's capabilities are limited, and a much larger telescope would be needed to decode such signals. The video concludes by considering the likelihood of advanced civilizations within our radio bubble.

What is the Square Kilometre Array (SKA) and what is its purpose?

How might a more advanced civilization detect our TV broadcasts?

What implications does the search for extraterrestrial intelligence have for our understanding of the universe?

What factors determine whether an alien civilization could have seen our broadcasts?