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If space aliens exist, here’s how we’ll find them

#1
C C Offline
Two esteemed astrophysicists peer into the future of space exploration.
https://nautil.us/issue/97/wonder/if-ali...-find-them

EXCERPTS (Martin Rees & Maro Livio): . . . We are perhaps near the end of Darwinian evolution, but technological evolution of intelligent beings is only just beginning. It may happen fastest away from Earth—we wouldn’t expect (and certainly wouldn’t wish for) such rapid changes in humanity here on the Earth, though our survival may depend on ensuring the AI on Earth remains “benevolent.”

Few doubt machines will gradually surpass or enhance more and more of our distinctively human capabilities. [...] the timescales for technological advances are an instant compared to the timescales of the Darwinian evolution that led to humanity’s emergence ... The products of future technological evolution could surpass humans by as much as we have surpassed slime mold.

But, you may wonder, what about consciousness?

Philosophers and computer scientists debate whether consciousness is something that characterizes only the type of wet, organic brains possessed by humans, apes, and dogs. Would electronic intelligences, even if their intellects would seem superhuman, lack self-awareness? The ability to imagine things that do not exist? An inner life? Or is consciousness an emergent property that any sufficiently complex network will eventually possess? Some say it’s irrelevant and semantic, like asking whether submarines can swim.

We don’t think it is. If the machines are what computer scientists refer to as “zombies,” we would not accord their experiences the same value as ours, and the post-human future would seem rather bleak. On the other hand, if they are conscious, we should welcome the prospect of their future hegemony.

What will their guiding motivation be if they become fully autonomous entities? We have to admit we have absolutely no idea. Think of the variety of bizarre motives (ideological, financial, political, egotistical, and religious) that have driven human endeavors in the past. Here’s one simple example of how different they could be from our naive expectations: They could be contemplative.

Even less obtrusively, they may realize it’s easier to think at low temperatures, therefore getting far away from any star, or even hibernating for billions of years until the cosmic microwave background cooled down far below its current 3 degrees Kelvin. At the other edge of the spectrum, they could be expansionist, which seems to be the expectation of most who’ve thought about the future trajectory of civilizations.

[...] Were we to detect ET, it would be far more likely to be electronic where the dominant creatures aren’t flesh and blood—and perhaps aren’t even tied to a planetary surface. ... If SETI succeeded, it would then be unlikely that the signal would be a decodable message. It would more likely reveal a byproduct (or maybe even a malfunction) of some super-complex machine beyond our comprehension.

The habit of referring to “alien civilizations” may in itself be too restrictive. A civilization connotes a society of individuals. In contrast, ET might be a single integrated intelligence. [...] Physical reality could encompass complexities that neither our intellect nor our senses can grasp. Electronic brains may have a rather different perception of reality. Consequently, we cannot predict or perhaps even understand the motives of such brains...

Conjectures about advanced or intelligent life are shakier than those about simple life. Yet there are three features that may characterize the entities that SETI searches could reveal.

• Intelligent life is likely not to be organic or biological.

• It will not remain on the surface of the planet where its biological precursor emerged and evolved.

• We will not be able to fathom the intentions of such life forms... (MORE - details)
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#2
Zinjanthropos Offline
Was thinking something like that the other day watching the Mars mission. The contraptions we leave on the surface eventually run out of steam, so how long can they sit there before they no longer can be revived? Millions of years? I think it’s entirely possible that during exploration of the cosmos our probes could definitely find an abandoned counterpart. Makes sense to me that if there are/were other intelligent life explorations going on then there should be more power drained probes/machines on planets than there are civilizations. How many planets have we explored or could we explore without actually ever having flesh & blood set foot on them?
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