An image from NASA's Spirit rover shows an unusual deposit of light-colored soil on Mars. The soil, primarily silica, suggests a possible past presence of hot springs or volcanic steam, hinting at a wetter Martian past and the potential for microbial life. This discovery, featured in Astronomy Pictures of the Year 2007, is a significant finding in the search for evidence of past life on Mars.

Astronomy Picture from 18/12/2007

Unusual Silica Rich Soil Discovered on Mars

Source: https://apod.nasa.gov/apod/ap071218.html


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