Did Mars once have a large moon?

Brian G Turner

Fantasist & Futurist
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Someone has suggested that Mars used to have a moon about a third of the size of our Moon, to explain a range of odd features about the surface of Mars. I have to admit I'm intrigued:

 
Interesting theory. And even more interesting to me is what might have happened to said moon Nerio? I find it more likely it was hit and destroyed than simply wandering away. But with Jupiter hanging around who knows.
 

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