One of the most encouraging signs for those searching for evidence of early water on Mars has been the existence of clays. But a French-US team has now rained on that particular parade.
NASA's Curiosity rover has beamed back the first telephoto images from the Martian surface, showing a mountainside marked by eroded knobs and gulches, and geological layering clearly visible.
Yesterday, an invader from another planet fired off a laser 30 times, in what we have to hope won't be seen as an act of aggression by any overlooked Martian inhabitants.
No this is not a report about a horrible diseases on Mars we could potentially bring back to Earth - that was pretty much the plot of The Andromeda Strain, except that disease came back from the moon.
Stunning images are already being beamed back from the Curiosity Mars rover as it undergoes a series of health checks before beginning its mission of exploration.