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NASA Spacecraft Finds Possible Mars Caves

Caves on MarsAn orbiting spacecraft has found evidence of what look like seven caves on the slopes of a Martian volcano, the space agency NASA said.

The Mars Odyssey spacecraft has sent back images of very dark, nearly circular features that appear to be openings to underground spaces.

"They are cooler than the surrounding surface in the day and warmer at night," said Glen Cushing of the US Geological Survey's Astrogeology Team and Northern Arizona University.

"Their thermal behaviour is not as steady as large caves on Earth that often maintain a fairly constant temperature, but it is consistent with these being deep holes in the ground."

The holes, which the researchers have nicknamed the "Seven Sisters", are at some of the highest altitudes on the planet, on a volcano named Arsia Mons near Mars' tallest mountain, the researchers report in the journal Geophysical Research Letters.

Source: Adelaide Now & Nasa
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