> I’d like to comment on the last paragraph. Can you elaborate
> on some of the claims you made here, such as the following:
> How and by whom was the moon ‘introduced’ into earth’s orbit?
You tell me-if one were so inclined, how would one put an orbiting body around a planet? When we terraform Mars 100yrs from now and come to the realization it needs a comparable moon to support tidal action, stabilize its orbit, and maintain the atmosphere we've created-how will we do this? And if I cannot answer "how" this means what?
As far as who, I already suggested "extraterrestrials", but if you are seriously asking specifically "who" then I would doubt the motive of your questions because obviously this is not something I could answer. Could be the Borg or Co-Magmen for all I know.
> The moon is perfect in size and placement – in comparison with
> what, and in relation to what?
There is nothing to compare it to. No other rocky planet in our solar system has one. Kind of the point.
In relation to the Earth and the Sun. The Moon is 1/400 the size of the Sun and 1/400 the distance from the Earth to the Sun. Today it is actually 1/389 but 600,000,000yrs ago it would have been a spot on 1/400. Regardless, it is this phenomenon that allows the Moon to perfectly cover the Sun during an eclipse allowing us to view the corona. As Isaac Asimov said of this:
If the Moon were a different size or had a different orbit life would not exist on Earth as we know it. And life would also have been much different if it were not as reflective as it is. The Moon is in the exact spot it is required to be, no other place it could be, for Earth to be what it is. The Moon is also the only orbiting body in the solar system with a stationary ( one side perpetually facing its host) and near-perfect circular orbit.Quote
There is no astronomical reason why the moon and the sun should fit so well. It is the sheerest of coincidences, and only the Earth among all the planets is blessed in this fashion.
According to astrophysicist Bernard Foing:
Kind of like what was on Earth for the 3 billion yrs prior to the Pre-Cambrian expolosion 600,000,000yrs ago .Quote
...the Earth’s moon has helped stabilize our planet so that its axis of rotation stays in the same direction. For this reason, we had much less climatic change than if the Earth had been alone. And this has changed the way life evolved on Earth, allowing for the emergence of more complex multi-cellular organisms compared to a planet where drastic climatic change would allow only small, robust organisms to survive.
> Why has the earth got ‘no business’ having such a moon?
It ain't got no business having one because no other rocky planet has a moon (Mar's "moons" for example are captured asteroids) let alone the 5th largest moon in the solar system and proportionally by far the largest compared to its host. The theoretical model that suggests the Moon was created by an impact, two impacts no less, by some unknown body is so complex as to be only valid in a computer model requiring a near impossible perfect storm of events. As Isaac Asimov also said:
It’s too big [the Moon] to have been captured by the Earth. The chances of such a capture having been effected and the moon then having taken up nearly circular orbit around our Earth are too small to make such an eventuality credible.
Post Edited (26-Jan-13 01:04)