Snow over Mars
The Phoenix lander aimed a laser at the clouds and found ice crystals about two miles above the surface. Mission scientists hope to see snow actually fall to the ground. NASA says the snow is water-based. Mars is too warm to support frozen carbon dioxide. “Scientists are able to determine that the snow is water-based and not carbon-dioxide snow, since temperatures on Mars are currently too warm to support the latter,” NASA adds.–Setting-the-record-straight-Tom
There’s also geological evidence of past liquid water on the planet.
Bonus cool thing:
Peter Smith, the lead scientist for the mission from the University of Arizona, said the team is going to try something new in the last weeks of Phoenix’s life.
The lander carried a microphone, which was designed to listen to the roar of the descent engines as the craft settled onto the Martian surface. The microphone was not used then. Now, Smith said, the scientific team intends to turn on the microphone “and listen to Mars for the first time.”
[Lidar chart: NASA, JPL-Caltech, U of Arizona, Canadian Space Agency]
OK, so we’re pretty positive about there being 
The scientific community eagerly watches the progress as Pheonix lander scours Mars. They are hoping that there will be signs that there was once a supply of water on the planet that would give evidence that there may have once been life on the planet. Most scientists seem to conclude, though, that data from the Opportunity indicates that the water was a toxic mix of salty water and minerals that would have been unsuitable for Earth-like lifeforms. [photo courtesy 
Space scientists have come up with a novel way of studying the moon (and possibly later other satellites like Europa). 
Anyone who has been following the recent missions to Mars are familiar with the ongoing speculation about if and how much water might exist on the Red Planet. This is an extremely important question, because the presence of easily accessible water would mean that future manned missions to Mars could use that water to produce fuel once they arrive - rather than having to bring it with them. 
Some dissent in the ranks at NASA; 
If we were to colonise Mars, we’d need to give it an atmosphere. The best way to do that would be to duplicate the creation of atmosphere here on Earth - by letting plant life do the work for us. With this in mind, 