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Caves found on Mars

Saturday, 22 September 2007 Cosmos Online Martian cavern: The image shows a possible cave opening informally called “Annie,” which has a diameter about double the length of a football field. The Thermal Emission Imaging System camera on NASA’s Mars Odyssey orbiter took the image and gathered data to show that the hole is cooler than surrounding surface in the afternoon and warmer than the surrounding surface at night. This is thermal behavior that would be expected from an opening into an underground space. Image: NASA