September 25th 2012
http://apod.nasa.gov/apod/ap120925.html
This picture depicts lots of tiny rock bubbles located on the floor of a crater on mars. This picture was taken by the robotic rover Opportunity earlier in September. While scientists have seen them on rocks around the planet, they have not been as densely packed as these bubbles here are. They are believed to have been naturally formed, but it is still unknown how they would have been formed by natural means. This shows that we still have a lot to learn about the red planet. Who knows, maybe they were gas bubbles formed from some event when the surface of the crater was hot enough to be molten? Or maybe they were bubbles from an ancient pool of water, boiling and then hardened by clouds of molten gas and rock? Hopefully, we'll find out soon!
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