Grandwolf319 , 2 days ago This is the answer, 100 different civilizations could have happened in our galaxy in the last 1 million years with only a few centuries of them emitting detectable signals. And it could be worse, it could be 10 civilizations in the last 1 billion years.
This is the answer,
100 different civilizations could have happened in our galaxy in the last 1 million years with only a few centuries of them emitting detectable signals.
And it could be worse, it could be 10 civilizations in the last 1 billion years.