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Forum: Science & Technology 2021-01-19, 08:32
Replies: 65
Views: 23,619
Posted By xilman
Why do you want to make it visible from the...

Why do you want to make it visible from the earth?

Use a few dozen nukes to dig 100-metre craters in a geometrical arrangement --- a diagram of the theorem of Pythagorus, for instance.

Then...
Forum: Science & Technology 2021-01-18, 17:14
Replies: 65
Views: 23,619
Posted By xilman
As I noted earlier in this thread, high-altitude...

As I noted earlier in this thread, high-altitude orbits are unstable to lunar and planetary perturbations over the course of a few megayears.

Also as noted earlier, leaving stuff on the moon is a...
Forum: Science & Technology 2021-01-18, 07:34
Replies: 65
Views: 23,619
Posted By xilman
But you may not. ...

But you may not.

https://en.wikipedia.org/wiki/Oklo
Forum: Science & Technology 2021-01-14, 08:34
Replies: 65
Views: 23,619
Posted By xilman
I have already commented on the "large" portion...

I have already commented on the "large" portion of your statement, giving African Grey parrots as an example.

Re-reading this thread lead me to realise that I should also have addressed teh "case"...
Forum: Science & Technology 2020-06-15, 08:35
Replies: 65
Views: 23,619
Posted By xilman
[QUOTE=ewmayer;547998]f we can find fossils...

[QUOTE=ewmayer;547998]f we can find fossils ranging from tiny pollen grains to T.Rex skeletons 100 million years later, a future race of similar intelligence will bloody well be able to find giant...
Forum: Science & Technology 2020-06-15, 08:31
Replies: 65
Views: 23,619
Posted By xilman
Octopodes are smart and gelatinous. They are not,...

Octopodes are smart and gelatinous. They are not, yet, social animals, but their ancestors may have been in the past.

I see no reason why a civilization has to inhabit the land any more than we...
Forum: Science & Technology 2020-06-12, 16:24
Replies: 65
Views: 23,619
Posted By xilman
Undoubtedly obvious. As obvious as the previous...

Undoubtedly obvious. As obvious as the previous ones.

The question is the really interesting part.
Forum: Science & Technology 2020-06-12, 09:18
Replies: 65
Views: 23,619
Posted By xilman
You may very well be right. However, I point...

You may very well be right.

However, I point to the abilities of African Grey parrots as an example that it doesn't matter how big it is, it's how you use it that's important.
Forum: Science & Technology 2020-06-11, 08:18
Replies: 65
Views: 23,619
Posted By xilman
In the long run, everything is dead. If...

In the long run, everything is dead.

If stars burning all their hydrogen doesn't get you, proton decay will.

Welcome to the real universe.
Forum: Science & Technology 2020-06-11, 08:16
Replies: 65
Views: 23,619
Posted By xilman
We should be careful to draw distinctions between...

We should be careful to draw distinctions between intelligence, civilization and high technology.

Taking just our own species for an example, we have been intelligent for many millennia and...
Forum: Science & Technology 2020-06-10, 09:06
Replies: 65
Views: 23,619
Posted By xilman
As I noted, the only thing we can be reasonably...

As I noted, the only thing we can be reasonably sure about is that if they existed, they did not use much coal as an energy source.

For those unaware of the reasoning: coal is principally...
Forum: Science & Technology 2020-06-09, 15:02
Replies: 65
Views: 23,619
Posted By xilman
Good point, but perhaps they would start by...

Good point, but perhaps they would start by re-mining the resources we have already dug up? Much the same way that Roman spoil heaps are now regarded as high-grade ore, though those deposits were...
Forum: Science & Technology 2020-06-09, 14:59
Replies: 65
Views: 23,619
Posted By xilman
Most of the stuff we have left behind is quite...

Most of the stuff we have left behind is quite fragile but at least weathering rates are low.

My guess is that they should be recognizable artificial for > 1M years. Not sure about 100M

Been...
Forum: Science & Technology 2020-06-07, 17:21
Replies: 65
Views: 23,619
Posted By xilman
After some megayears of squidging (technical...

After some megayears of squidging (technical term) at high pressure, high temperature, high humidity, essentially all bricks will end up as reconstituted clay and not at all rectangular. That...
Forum: Science & Technology 2020-06-06, 21:06
Replies: 65
Views: 23,619
Posted By xilman
Perhaps. Given that roads, buildings, etc are...

Perhaps. Given that roads, buildings, etc are rock it is not so clear to me.
Forum: Science & Technology 2020-06-06, 21:05
Replies: 65
Views: 23,619
Posted By xilman
All of which are extremely prone to weathering...

All of which are extremely prone to weathering unless they are located in gently sinking mud such as are to be found at New Orleans and Amsterdam. Manhattan is not a good example. One half-way...
Forum: Science & Technology 2020-06-06, 09:39
Replies: 65
Views: 23,619
Posted By xilman
I don't have the time and knowledge yet to answer...

I don't have the time and knowledge yet to answer your chemical marker questions. However, I think you will find that high altitude orbits are unstable on timescales of a megayear or so due to...
Forum: Science & Technology 2020-06-05, 17:33
Replies: 65
Views: 23,619
Posted By xilman
Nothing. Please apply Hanlon's Razor in this...

Nothing. Please apply Hanlon's Razor in this instance.

That said, they are much more eroded than their co-evals. Mesoamerican pyramids are such recent constructions that it's hard to tell their...
Forum: Science & Technology 2020-06-05, 09:02
Replies: 65
Views: 23,619
Posted By xilman
The pyramids, African and American, are already...

The pyramids, African and American, are already looking very much the worse for wear after < 5000 years. They will have weathered away completely long before 100M years are up. I suspect that any...
Forum: Science & Technology 2020-06-05, 08:03
Replies: 65
Views: 23,619
Posted By xilman
Long term evidence of civilization.

That article contains the statement "This result stems from humanity’s relatively late appearance in Earth’s habitable window, suggesting that its development was neither an easy nor ensured process....
Showing results 1 to 20 of 20

 
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