Originally Posted by
Eric the Green
So aliens are like alchemists who can turn lead into gold, and so they don't need to come here to mine our precious minerals. But we don't know that is true about all alien races. And the stories I heard that they have come here for our minerals may still be true, whether or not it matches your theories about what aliens ought to be able to do.
Biology could be different, so maybe they would come trading phosphorus even-up for arsenic. Considering also that "life" -- if defined by metabolism (even if it is "electrical power), self-repair, individuality, and reproduction -- might be what follows us or even becomes the means of contact, the contact between sophisticated civilizations might between silicon-based creatures that resemble R2D2 and C3PO. Such may be the life that follows us after the Earth becomes uninhabitable by carbon-based life when our past-prime environment for carbon-based life becomes excessively warm. I have plenty of hope for intelligent life on Earth a million years from now -- it just won't be us.
High intelligence is not enough. There is other intelligent life living on the rocky parts of a planet in our universe... that rivals Man in intelligence.
(By the way -- "Dumbo" and his family just called, and they are insulted by the use of the elephant as the symbol of a political party that isn't so bright).
We don't communicate with elephants well. Elephants have many means of killing us because and often good cause to do so because we have hunted them... we remind them all too much of lions and tigers, as do (this may be a surprise) dogs. Elephants kill dogs on sight, perhaps figuring that they are our brutal accomplices. Of course, elephants are unlikely to ever work metal or construct buildings out of the trees that they knock down. Zoos can easily establish protocols for keeping Big Cats... but not elephants. (Dogs are smart and lethal predators too, but we know the rules with our equals in the food chain).
As for the character of advanced civilizations: incandescent light has been on Earth for only about 140 years. Some civilization far away from here may be turning its detectors seeking planets like theirs that show the prospect of life, might find that ours is in the right thermal range, but see no indication of any advanced civilization upon it (the Earth, of course). The Earth is 'hot' in radio frequencies for its temperature, but even that would not be discovered should the Earth be within the magnetic field of Jupiter. (That's the source of much of the radio and television static).
We might have minerals that don't exist in mine-able quantities elsewhere, here on this very special unique planet!
Sand? The definitive source of silicon.
The greatest evil is not now done in those sordid "dens of crime" (or) even in concentration camps and labour camps. In those we see its final result. But it is conceived and ordered... in clean, carpeted, warmed and well-lighted offices, by (those) who do not need to raise their voices. Hence, naturally enough, my symbol for Hell is something like the bureaucracy of a police state or the office of a thoroughly nasty business concern."
― C.S. Lewis, The Screwtape Letters