There
have been several claims in the past that hot springs were spotted on Mars, however they haven't been confirmed yet. Now, the high-resolution
camera on board the Mars Reconnaissance Orbiter took several pictures of what appears to be 'spring like' mounds in Vernal Crater in Arabia Terra.
The features were discovered by Johnson Space Center researchers Carlton Allen and Dorothy Oehler and present two possible ancient hydrothermal springs appearing as light-tones, elliptical structures. According to Allen, the two features bear a striking resemblance to the spring mounds found in Dalhousie, Australia.
Possible spring mounds in Vernal Crater, Arabia Terra, Mars
Spring-like mounds seen in Dalhousie, Australia