Not really water on Mars?
Back in 2004 I wrote about the evidence scientists were finding for water on ancient Mars, and the arguments for and against it on the surface of Mars today. Now we’ve got some great pics that could settle the question? While the pics certainly show a flow of some kind that has happened since 2001, not all scientists are convinced that they are evidence of flowing water. Read More for these less sensational viewpoints.
Other possibilities include sublimating carbon dioxide (the idea has been reported on before), and dust slides though usually events credited as dust streaks are darker.
I wonder a bit at the timing of this announcement which coincides nicely with the announcement of a return to the moon by 2020.
Comment posted on 2-29-2008
NOT water on Mars - scientists think it was an avalanche of dry debris. Full story on Astronomy.com