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4 votes

What are the dark areas on the moon?

Wikipedia differentiates the compositions between the brighter highlands and darker Maria on the Moon (citing Ref. 1): The relatively low silica content suggests that all regions are composed ...
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4 votes

Could there be caves on Mars in the areas inside Jezero crater and the watershed west and north of it where the Mg carbonates are detected?

Cornelis! You like asking curly questions don't you! ;-) I've been thinking about this question, on and off since it was posted. Regarding your question of whether there might be caves in the ...
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3 votes

Could there be caves on Mars in the areas inside Jezero crater and the watershed west and north of it where the Mg carbonates are detected?

This YouTube video shows tiny caves in a Martian Rick taken by Perseverance. The cave openings are only millimeters across as the entire field of view is only 60 mm wide, so we can't go spelunking in ...
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