I am sure most of you have by now heard at least a garbled version of the discovery of a very unusual object in the skies, a possible alien mega-structure. I have not been following the mass media but they probably went for the spectacular in their reporting.
Well, it could be spectacular, but only if after a few years or even decades of hard science it does not turn out to be something else. Some science news outlets have compared it to the discovery of the pulsar by Jocelyn Bell. There was no known explanation at the time for something in the heavens that could generate a pulse train that was so precise you could set your time standard to it.
Still, an alien civilization is a candidate explanation, even if the only thing we can say is “We’ve got something we’ve never seen before and some of our wild ass guesses, including an alien civilization, have not yet been ruled out”. I want to make this absolutely clear before I get to the fun stuff.
Now… what if it turns out to be true and we find we have a neighbor who is building structures in space large enough to obscure up to 20% of its sun’s output for significant periods of time? That is one serious civilization, one that is well on its way to becoming a Kardeshev Type II.
But let us turn things around. If they exist, what do they know about us?
The star in question is about 1400 light years away from us. That means what we are seeing happened back in the dark ages, back in an era oft written of in books by Dr. Sean Gabb in his historical novels. Whatever we are detecting now of their technology happened that long ago. Fourteen Hundred Years of advancement beyond what we can see. One and a half millennia. Just imagine it.
Lets go further. Fourteen hundred years ago they were building structures that could block 20% of their star’s light when passing in front of it. That is not the capability of a new space faring civilization. In our terms, it is probably several millenia beyond where we are in our space capabilities, possibly even more.
So how many thousands of years ago did they map a lovely little life bearing world? They almost certainly have thousands of years of data on our star and planets. But their data shows no sign of civilization because their most recent data about us comes from our 600AD.
Unusual situation then. We would know there is a space faring civilization out there… and they would only know there was a life bearing world with no signs of a technological civilization here.
So… I wonder when the generation ships of the colonists will show up?
I’m just having a bit of fun. But What If?