Another cave found on Mars
Mars Reconnaissance Orbiter has found another cave on Mars. The cropped version of the image, shown below, shows a remarkably symmetrical crater that probably has more similarities to sinkholes on earth. In the center is a 100 foot wide skylight into a cave. The crater is almost certainly formed partly by material dropping into the cave.
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awesome!
This photo looks like I’m looking at the point of a sharpened pencil.
This has the classic look of a karst sinkhole on Earth. But since karst implies limestone or dolomite (organic origin), that’s doubtful. I sure would love a reduced gravity rappel into it!
Karst on the slopes of Mons Pavonis, a shield volcano, would indeed be unexpected. The temperature of lava is quite enough to crack Calcium Carbonate out into Calcium Oxide and CO2. So, it’s a lavatube.
This sinkhole terraformed!!! https://fotos.subefotos.com/72122e2d6a1db60a4559b8d1da949215o.png