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The Busy Center of the Lagoon Nebula

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Aliens haven't contacted us. Scientists found a compelling reason why. (mashable.com)

submitted 4 months ago by [email protected] to c/[email protected]

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tectonic planet are rare

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[–] Grandwolf319 5 points 4 months 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.