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DetlefK

(16,423 posts)
14. Let's take Proxima Centauri as an example.
Mon Mar 5, 2018, 05:46 AM
Mar 2018

The star Proxima Centauri is 4 light-years away, has planets, but none of them is habitable for humans.

Let's say, there was an alien civilization on Proxima Centauri and it stopped sending radio-signals 100 years ago. That means, their very last signals arrived on Earth 104 years ago, in 1914.

We would never know that these signals passed by us, because we weren't listening, despite their home-planet being just around the corner and their civilization going through crisis just a few centuries ago.

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