Huge, deep hole on Mars leaves scientists baffled
A depression huge and deep on Mars has left astronomers baffled.
It was discovered by NASA's Mars Reconnaissance Orbiter (NRO), which has been studying the Martian surface for 11 years. The vast pit, estimated to be hundreds of feet across and surrounded by frozen carbon dioxide, is located on the south pole of Mars— sticking out among the Swiss cheese terrain of Earth’s closest neighbor.
According to NASA, “the depressions are thought to be caused by sublimation, which is when a material goes directly from a solid to a gas phase.”