Question Earth Moon Origin

[Catastrophe]

Billslugg, some of these might interest you:

gaia collision video - Bing

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www.bing.com

There is another somewhere I have mislaid. It shows diagrams at intervals like 1 minute, 10 minutes, 1 hour, 4 hours . . . . . . something like that.

Cat

 

[billslugg]

The galaxy video is mesmerizing. The interaction really tore the tiny galaxy to shreds. First it makes it a needle then a cloud. Very interesting.

 

[Catastrophe]

If you put balloons on the surface of the pool water and pull the plug they will simply gather together in the center. If they pool is big enough, say hundreds of miles across, and is not located on the equator, then the Coriolis force will result in the bunch of balloons rotating. The amount of angular momentum of any such gathering is proportional to its area. A small knot within a large assemblage will have only a tiny angular momentum, not sufficient to explain the Moon's. This pretty much rules out coformation from dust knots. It leaves collision or capture. Collision is far more likely as there are many spots on Earth where a good hit would make a Moon. There are not a lot of spots the Moon and a third body could do a dance resulting in the capture of the Moon. Collision requires two bodies, somewhat rare. Capture requires three bodies, extremely rare. Also, the Moon crust and Earth crust are identical. This rules out capture. Collision is the only one that can account for all the data. There are still some nagging details they can't figure out.

Billslugg

There are still some nagging details they can't figure out.

Are you now happy with the 1%/13% "problem"?

Cat

 

[Inmymind]

I had not seen that one, it is really detailed. It gives two bodies, one of which falls back to Earth, the other stays out there to become the Moon. What is very evident is that the outcome is extremely dependent on the offset between the two bodies. This means that the impact scenario is flexible, can account for most any observation today simply by changing where it hit.
I would like to see a similar movie showing how an accretion scenario might work out.

"I would like to see a similar movie showing how an accretion scenario might work out"

Me too, but I wonder how many movies could be modelled to fit the "facts" in any current scenario.
I am hopeful that as more data comes in more refined modelling will emerge.

 

[billslugg]

All you need to do is show one plausible way of forming the Moon by impact to keep the impact theory alive.

 

[Inmymind]

All you need to do is show one plausible way of forming the Moon by impact to keep the impact theory alive.

Science will move in the direction of more accurate reflection