This is by far the best April Fool's joke!
Ultimate-Guitar.com reported, " This Monday in NASA everybody lost their heads," commented Alex Bushmills of the research team. "The #078_01H square initially seemed blurry, but once the detailed shot was taken, I couldn't believe my own eyes - it was Dave Grohl. I've been a big fan of Grohl since Nirvana, and there can be no mistake - it was his face looking at me from the surface of Mars!"
They went on to say that Dave's face should be visible to the eye on the surface of Mars on April 8th.