![](https://webarchive.library.unt.edu/eot2008/20080916081701im_/https://astrobiology.nasa.gov/img/_placehold/placehold-ask.jpg)
![Ask an Astrobiologist](https://webarchive.library.unt.edu/eot2008/20080916081701im_/https://astrobiology.nasa.gov/img/text/ask-an-astrobiologist.gif)
"I understand that both Saturn and Jupiter have extreamly active atmospheres and give out lethal doses of radiation, so are they hot or cold?"
-
Silicate Mineralogy on Mars Indicates Wet Past
Using data from the CRISM instrument on NASA’s Mars Reconnaissance Orbiter, astrobiologists from NAI’s SETI Institute and Marine Biological Laboratory teams present findings of silicate mineralogy indicating a wide range of past aqueous activity in the Mawrth Vallis on Mars. This work, published in the August 8 issue of Science, suggests that abundant water was once present on Mars and that hydrothermal activity may have occurred. The Mawrith Vallis could be a landing site for future rover missions to Mars.
![Recent Articles](https://webarchive.library.unt.edu/eot2008/20080916081701im_/https://astrobiology.nasa.gov/img/text/hd_recent_mb.gif)
- NASA Chooses MAVEN as the Next Mars Scout Mission
- NASA's Carl Sagan Fellows to Study Extraterrestrial Worlds
- Looking for Life on Mars – in a Canadian Lake
- Mars Research in Polar Bear Country
- Iron Isotope Record Reflects Microbial Metabolism Through Time
- Silicate Mineralogy on Mars Indicates Wet Past
- Jack Hills Zircons: New Information About Earth's Earliest Crust
- ASTID Funds 15 New Projects
- Liquid Water in the Martian North? Maybe.
- Astrobiology Rap