![](https://webarchive.library.unt.edu/eot2008/20080922233849im_/http://astrobiology.nasa.gov/img/_placehold/placehold-ask.jpg)
![Ask an Astrobiologist](https://webarchive.library.unt.edu/eot2008/20080922233849im_/http://astrobiology.nasa.gov/img/text/ask-an-astrobiologist.gif)
"We know that Mars once had liquid substances flowing over its surface, but why do we think it was water? Could it not have been something else?"
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Habitability Seminar (continued)
Please check back for details.
![Recent Articles](https://webarchive.library.unt.edu/eot2008/20080922233849im_/http://astrobiology.nasa.gov/img/text/hd_recent_mb.gif)
- NAI Launches FAR Seminar Series on October 6th
- Early Earth Primed for Later RNA and DNA Production
- Molecules in the Atmospheres of Extrasolar Planets - A Workshop in Paris
- Cyanobacterial Biomarkers in Ancient Rocks
- Evolution of the Gut
- Jill Tarter and Will Wright Talk Gaming, Education, and Evolution in Seed Magazine's Video 'Salon'
- 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