> The correct answer is "I don't know". Is it? 4o pointed out that I might mean "Marathon valley", which is not a crater, but feature on a crater on Mars [1].

> The correct answer is "I don't know". Is it? 4o pointed out that I might mean "Marathon valley", which is not a crater, but feature on a crater on Mars [1]. I think it's a more correct answer. [1] https://en.wikipedia.org/wiki/Timeline_of_Opportunity#2015 https://en.wikipedia.org/wiki/Timeline_of_Opportunity#2015