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From: Don Y <blockedofcourse@foo.invalid>
Newsgroups: sci.electronics.design
Subject: Re: Expedition to Europa
Date: Sat, 29 Jun 2024 10:11:39 -0700
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On 6/29/2024 8:35 AM, Joe Gwinn wrote:
> On Sat, 29 Jun 2024 04:04:11 -0700, Don Y
> <blockedofcourse@foo.invalid> wrote:
> 
>> On 6/28/2024 10:08 PM, bitrex wrote:
>>> On 6/27/2024 5:17 PM, Don Y wrote:
>>>
>>>>> Most big librarys carry AW.
>>>>>
>>>>> .<https://europa.nasa.gov/mission/about/>
>>>>>
>>>>> If it turns out that there is life in the ocean of Europa, which has
>>>>> existed for something like four billion years, it supports the general
>>>>> idea of "random but inevitable" theories of Abiogenesis.
>>>>
>>>> _Remembrance of Earth's Past_ has an interesting take on the whole
>>>> notion behind an "empty" universe.  It's a tedious read (mainly for
>>>> me coming from a non-chinese culture... just keeping track of the
>>>> characters is difficult) but has some good ideas to chew on at its core.
>>>
>>> My guess: The Universe is mammoth, the technological and energy requirements of
>>> even short-distance interstellar travel are immense, the lifespan of
>>> technological civilizations is highly time-limited before such a civilization
>>> destroys itself, technological civilizations are very rare to begin with, and
>>> no technological civilization ever survives long enough to attempt it.
>>
>> That wouldn't explain why there are no *signs* of intelligent life.
>>
>> *We* can't (yet) travel interstellar distances in single lifetimes
>> but I'm sure anyone with technology comparable to ours would be able to
>> *detect* our presence (given that we seem to make no attempt at "hiding")
>>
>> _If the Universe Is Teeming with Aliens ... WHERE IS EVERYBODY?_ gives some
>> interesting takes on the Fermi paradox.
> 
> That's a bit self-important.
> 
> If the universe is teaming with life, but alien civilizations capable
> of interstellar travel are exceedingly rare, there would be little
> reason for those spacefaring aliens to visit any but the other
> advanced alien civilizations.
> 
> We might get the equivalent of an anthropologist ever few million
> year, and they would do whatever needed to prevent detection by that
> which they study.

Why does an alien race have to VISIT in order to EXIST?

*We* can't visit anything beyond lunar orbit (perhaps Mars, soon)
yet we expend considerable effort "looking".

What techniques have our deep space probes used /to prevent detection/?