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Two Moons

rjh01 said:
Just to save a few posts here are some thoughts on the book "Who built the Moon"
http://www.webmasterworld.com/forum9/9385.htm

So funny. What more needs to be said?
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You know, I had to sate my curiosity and look up information on this book.

*SPOILER ALERT*

Apparently the author claims that the moon was created by time travelers from Earth, and that we should initiate some sort of program to go back in time and build the moon.

I'm not quite sure if it's some sort of elaborate ruse, perhaps the author is a sort of avant garde performance artist. Perhaps he wanted to write an entire novel while swimming in a pool of Peyote and LSD. Perhaps the author is actually an extra terrestrial who is playing some sort of a prank on the human race, as a test to see what percentage of people living on this planet are absolutely stone cold nuts.

I'm sort of glad that this book happened to pop up in this thread, I'm almost tempted to buy it and just leave it on my coffee table so that people who come visit will think I'm stark raving bonkers.
 
CrikeyBobs said:
I'm finding it difficult to picture what that would be like. It doesn't seem possible but these diagrams help explain.
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D'oh, I stand corrected. I was picturing the earth and moon as a spirograph wheel running around inside a larger ring. If I had had the earth/moon wheel running around the outside of an inner disc it would have been more accurate.

Steve S
 
Uncle Vanya said:
You know, I had to sate my curiosity and look up information on this book.

*SPOILER ALERT*

Apparently the author claims that the moon was created by time travelers from Earth, and that we should initiate some sort of program to go back in time and build the moon.(snip)

(Quote) To take a bit without reading the whole gives the wrong impression. The book in question is a very clever account how the ancients used orbiting bodies to bring about standard measurements. eg. The megalichic yard and time, plus they knew the world was a ball which they broke up into 365%
Try reading the book with a open mind and I feel sure it will impress you.
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JoeTheJuggler said:
You mean in our solar system only, right? We really don't know how common a large moon (double world) is elsewhere. (For that matter, before Pluto/Charon got demoted, it would qualify as a double planet.)

From the evidence of our solar system, we do know that the early history of it was quite violent. Pretty much all the rocky planets and moons show the scars of frequent, and sometimes very large impacts. If our moon was formed by a very early, very large collision, it could be that large moon formation is not so terribly rare.
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.
J.B.S. Haldane remarked that the universe is not only stranger than we imagine, it's stranger than we -can- imagine!
This came up with the first good images of the Saturnian satellites, with their unique characteristics.
 
Like this one?

HadeanLandscape.jpg

This one, though, is scientifically accurate, showing the moon during the Hadean era about 4.3 billion years ago, shortly after it was formed, and still molten. This drawing was first seen in "The World We Live On" by Ruth Moore, published in 1956 (a year before Sputnick) as part of the International Geophysical Year (I assume) and famously serialized in Life Magazine. I presume the picture was painted by Sue Allen, the illustrator of he book. It contains the famous dinosaur murals from Yale. A wonderful book, it probably started me on the path o science in he 2nd grade.
 
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Scientifically accurate:
assign5_moon.jpg
 
Another interesting bit is we have two moons one little body with a strange woopydo orbit only found in recent years. And could many of the craters on the big moon be from electric splats? The bottoms of most craters are flat? No water, no wind how come?
 
Old Bob said:
Another interesting bit is we have two moons one little body with a strange woopydo orbit only found in recent years.
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Calling things like Cruithne 'moons of Earth', is perverse. In no sense do they orbit Earth. (and there are several such known orbit resonance asteroids)

Old Bob said:
And could many of the craters on the big moon be from electric splats?
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No.

Old Bob said:
The bottoms of most craters are flat?
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Yes.

No water, no wind how come?
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Lack of atmosphere.
 
[QUOTE=nathan;

Not all impacts break through the crust or be volient enough to melt a flat surface in the bottom of a crater, we have a surviving crater in Australia that is rubble in the bottom (Wolf Crater W.Aus) so again, why is the moon craters bases flat? They can't all be molten lava? Perhaps a electric splat is not so mad after all. "Lack of atmosphere" is all the more reason that they would be preserved. Think we have been led up the garden path.





Lack of atmosphere. Nathan said
 
Old Bob said:
QUOTE=nathan;

Not all impacts break through the crust or be volient enough to melt a flat surface in the bottom of a crater, we have a surviving crater in Australia that is rubble in the bottom (Wolf Crater W.Aus) so again, why is the moon craters bases flat? They can't all be molten lava? Perhaps a electric splat is not so mad after all. "Lack of atmosphere" is all the more reason that they would be preserved. Think we have been led up the garden path.





Lack of atmosphere. Nathan said
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No, I did not say that was the cause of flat bottomed craters and neither did I write that first paragraph -- please be more careful with your quoting. I said that was the cause of the lack of wind and lack of water. I made no comment about whether lava caused flat bottomed craters.

If you want to discuss 'electric splats', I think a new thread would be best.
 
nathan said:
No, I did not say that was the cause of flat bottomed craters and neither did I write that first paragraph -- please be more careful with your quoting. I said that was the cause of the lack of wind and lack of water. I made no comment about whether lava caused flat bottomed craters.

If you want to discuss 'electric splats', I think a new thread would be best.
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In other words you just don't know like the rest of us,but you make out you do?
 
Old Bob said:
...Not all impacts break through the crust or be volient enough to melt a flat surface in the bottom of a crater, we have a surviving crater in Australia that is rubble in the bottom (Wolf Crater W.Aus) so again, why is the moon craters bases flat? They can't all be molten lava? Perhaps a electric splat is not so mad after all. "Lack of atmosphere" is all the more reason that they would be preserved. Think we have been led up the garden path.
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I'm not sure what you're driving at, but for one thing, not all lunar craters have flat bottoms (Tycho doesn't, and it's one of the most prominent). Further, I'd hardly use Wolf Creek Crater (a mere 875 meters wide) as a model for the vastly larger impact craters you see on the moon.

Really, there's absolutely no mystery here whatever.
 
Old Bob said:
In other words you just don't know like the rest of us,but you make out you do?
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What are you talking about? You made some claims and appeared confused as to why there was no wind or water on the moon. I told you why there's no wind or water.

If you have a hypothesis about crater formation, please start a new thread, rather than derailing this one further.
 
Old Bob said:
Think we have been led up the garden path.
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I think that has to be true for one of us, at least.

The main reason why a crater floor measuring hundreds of miles across is relatively flat is because of gravity. Gravity likes to pull things down back into a ball, to convert as much potential energy into heat as possible. It will allow for rolling hills and the crater walls, perhaps with relief of up to a couple of kilometers, but on the size scale of the craters that is almost unnoticeably small. Also, you cannot see most of the relief, as you are looking down on it from above.

Most of the moon's surface was paved by molten lava when the moon was created and immediately after, in the late heavy bombardment, due to the afore-mentioned potential energy conversion. That is where the moon's maria ("seas") were created.

Last time I tried it, electricity didn't splat - it burned holes.
 
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