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Comment by Matt_Mahgerfteh | Hacker News Reader

Yeah, it's like we're playing cosmic detective trying to figure out if there's anyone else out there in the universe. The fact that we haven't seen any clear signs of alien civilizations doing their thing is kind of mind-boggling. It's like, are they just really subtle about it, or are we just super early to the party?

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When you mine asteroids in orbit on a large scale around your star, the released dust/debris would form an IR halo around the star that would be very easy to detect and reveal your presence but we dont see any of it.

So, early humans it propably is.

Your point on missing IR halos is valid, but don't overlook anomalies like Tabby's Star (KIC 8462852) [0]. Its odd dimming led to theories about alien megastructures like Dyson Spheres, though dust or comets are possible explanations. Still, Tabby's Star highlights the difficulty in excluding advanced alien activities with our current tech. [1]

[0] https://en.wikipedia.org/wiki/Tabby%27s_Star

[1] https://youtu.be/mZve2Oy3cFg?t=82

This person [1] ran a data search for stars with a similar light profile (“slow dippers”) to Tabby/Boyajian’s Star, and claims to have found a cluster of similar stars in the region. But the results are not particularly high confidence and are probably just data artifacts.

[1] https://iopscience.iop.org/article/10.3847/1538-3881/ac3416

Would you pollute your environment with missiles at orbital speed? I suppose given our stellar stewardship of the atmosphere, maybe they're like us.

I don’t think we’re going to build rock crushers in space. With all that available energy it’d make more sense to just throw the whole rock into a smelter and fractionate the elements as they boil off. Why waste the slag either? You need all the material you can get so hang on to it and use it as ballast or extract the carbon and silicon from it. It’s more likely that we don’t see waste because there isn’t any, a dollar saved is a dollar earned.

Or if there is some dark foresting going on or one of a dozen other theories

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