Scientists Identify 29 Planets Where Aliens Could Observe Earth

In 2017, the first known interstellar object in our Solar System was detected at the observatory in Hawaii. It was the Oumuamua asteroid. Scientists don’t know what it’s made of. And some suggest that it’s not even an asteroid, but an extraterrestrial technological object sent to our system for observation. Why can’t anyone say exactly what it is? The fact is, Oumuamua was only discovered when it was leaving the Solar System. It was detected at a distance of thirty-three million kilometers from the Earth. So, we have no idea who and when visits our Solar System. This is despite the fact that scientists have recently reported that there are twenty-nine exoplanets in our galaxy from which it’s possible to observe the Earth and even intercept our radio transmissions.

How do we know if aliens are watching us? Can we set the alarm on the entire planet? And how can we prevent an alien invasion?