May I get technical for a moment? The calculated mean density of the Moon is 3.346 grams per cubic centimeter. That of Mars is 3.93 grams per cubic centimeter. Mercury is 5.43, Venus 5.20, and Earth 5.52 grams per cubic centimeter. So what is the Moon most closely related to?
The circumference of the Moon is 10,917 Km., and on Mars, there's a 'canyon' of relatively unknown real depth, ranging in width from about 6 Km to as much as 140 Km approximately, and a length of about 5,000 Km. Let's imagine that's an old scar from when Mars got punctured by that Pluto-sized meteoroid billions of years ago. If we could open up that 'canyon' of about 5,000 Km long, to form a circle, it would be just about the right size for our Moon to pass through. And I wouldn't be surprised if that's where it came from. Think about it....
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