upvote
Non-human intelligence sharing the planet with us is a mundane explanation. It's a completely trivial possibility in the vastly expansive fields of biology and physics. Earth is known to host extremely complex life and is the only known planet to do so. To look for unknown forms of life one need only look at their feet. Bacteria was a previously unknown, extremely expansive form of life on Earth.

We unlocked the secrets of the atom and gained within it the capability of ending all life on earth trivially. Other secrets being locked behind physics isn't a radical speculation. In fact, it's surprising that we haven't really seen any since.

reply
Before we had the instruments to observe them directly we could theorize about the existence of bacteria because we could indirectly observe them through their effects on our biology and even their macroscopic effects on populations, effects that had no better explanations. I am not aware of any mysteries that are most simply explained by a hitherto unobserved, technologically advanced (I assume we're not talking about dolphins when we say) "non-human intelligence", whether they supposedly dwell in the depths of the ocean, the Earth's crust, Titan, or anywhere else in the universe. SETI has been listening for ~60 years and hasn't heard a peep from any of the billions (trillions?) exoplanet's worth of radio signals that could have reached us in that time.

The available-to-me evidence suggests that technologically advanced species are exceedingly rare, and the only such species we're aware of emits an overwhelming number of artifacts that would serve as evidence for its existence, so it would be very much not mundane to discover that another one has been living under our noses this whole time.

I am not making a truth claim here, as in "it's definitively untrue that there are non-human intelligences sharing the planet with us," I'm just arguing that it's an extraordinary claim that should require extraordinary evidence - grainy footage and hearsay isn't enough for me.

reply
>I am not aware of any mysteries that are most simply explained by a hitherto unobserved, technologically advanced (I assume we're not talking about dolphins when we say) "non-human intelligence"

This is precisely the point. You aren't aware of these mysteries, despite the earnest attempts of many to bring them to your direct attention.

There is no longer any attempt to hide the mysteries categorically, so this lack of information is now on you.

>I am not making a truth claim here, as in "it's definitively untrue that there are non-human intelligences sharing the planet with us," I'm just arguing that it's an extraordinary claim that should require extraordinary evidence - grainy footage and hearsay isn't enough for me.

Yes, that's why the correct scenario is wide declassification of the premises that are asserted in this regard, i.e. to make general knowledge of unidentifiable phenomena which have no definitive known cause or origin, communication with these entities, capture of their technology, etc. All of these things could be explained by various competing theories, some of them "simple" (funny how Occam's razor is always just what I prefer), but this information, which has been trickling out from credible sources, needs to be brought into the public space and then we get to decide what it implies or doesn't imply.

Right now there is a deliberate veil of secrecy and serious mysteries that aren't denied by anybody serious. They definitively exist.

reply
> Right now there is a deliberate veil of secrecy and serious mysteries that aren't denied by anybody serious. They definitively exist.

OK, I get that you're a cryptozoology/"aliens walk among us!" kinda person, but...

A lack of evidence against a theory is never evidence for the theory. It's very hard to prove a negative.

reply
Curious that you immediately descend into partisan thought short-circuiting and now that that didn't work, you come up with a new angle.
reply