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Anonymous Coward writes:
https://www.businessinsider.com/alien-civilizations-may-have-already-colonized-galaxy-study-2019-8
The Milky Way could be teeming with interstellar alien civilizations — we just don't know about it because they haven't paid us a visit in 10 million years.
A study published last month in The Astronomical Journal[$] posits that intelligent extraterrestrial life could be taking its time to explore the galaxy, harnessing star systems' movement to make star-hopping easier.
The work is a new response to a question known as the Fermi paradox, which asks why we haven't detected signs of extraterrestrial intelligence.
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Fermi Paradox Paper: Aliens Could Take Their Time Settling the Galaxy
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Can anyone remember when the times were not hard, and money not scarce?
(Score: 2) by Immerman on Tuesday September 10 2019, @03:54PM (4 children)
Umm - the deltas didn't exist back then. Neither did the mountains, or most any other geological feature present today. The planet was entirely different then, and almost everything that was on the surface then is now either deep underground or long since eroded away. And most of the junk would have long since degraded - you find a dinosaur skeleton near some red-smeared rock stains, you're not going to know that those smears are all that's left of rusted-out industrial earth-moving equipment.
Alexandia was founded all of 2300 years ago. The dinosaurs went extinct 30,000x as long ago. Nothing "common sense" about archaeology is remotely relevant on those kinds of timescales.
(Score: 0) by Anonymous Coward on Tuesday September 10 2019, @07:39PM (3 children)
today's deltas will be rock formations in 60 million years.
as far as I know there are several important dinosaur sites that were preserved because they were river beds or deltas during the itme of the dinosaurs.
"the reddish smudge" is a reddish smudge; anything that could degrade a block of reinforced concrete that way would also degrade the dinosaur skeleton next to it.
(Score: 2) by HiThere on Tuesday September 10 2019, @08:42PM (2 children)
You are overly optimistic about the durability of concrete. The Romans made more durable concrete than our modern stuff, and I don't think their stuff would last that long.
Javascript is what you use to allow unknown third parties to run software you have no idea about on your computer.
(Score: 2) by dry on Wednesday September 11 2019, @06:08AM
Bones are even less durable and we find evidence of them going back for 100's of millions of years. The same or similar processes such as mineral replacement could preserve concrete, metal and even plastic.
(Score: 0) by Anonymous Coward on Wednesday September 11 2019, @07:38AM
once you bury it in mud and you bury the mud under more mud, it will leave a lasting trace. just like bones and wood and feathers.