NASA finds evidence of liquid water flowing on the surface of Mars
     NASA told us it was announcing something big today,  and it's certainly come up with the goods: the space agency says images  from the Mars Reconnaissance Orbiter (MRO) have revealed compelling  evidence of liquid brines flowing across the planet's surface. The  seasonal rivers of salty water mean there's a greater chance of Mars  being able to support life now or in the future.  As far as space  exploration goes, it's one of the most significant and historical  announcements in many years, but it's not completely unexpected. NASA  scientists have known for some time about the appearance of gullies or  dark streaks on the surface of Mars during warmer weather - while it was  suspected that trickling water was the cause, the new evidence means  NASA is now almost certain.  What's  changed is that the agency's scientists have managed to identify and  track hydrated salts in these gullies - using an image spectrometer on  the MRO, the NASA team has been ab...
