Martian 'Happy Face' Crater

Astroturtle writes "The two pictures shown here are taken from the same daily global image mosaic (the only difference is that each was processed slightly differently). The pictures show Galle Crater, informally known as 'Happy Face,' as it appeared in early southern winter."

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Strata

[Bonker]

A while back, Terry Pratchett wrote a book called 'Strata' in which the main plot premise was that Humans were terraforming the entire galaxy planet by planet, leaving 'history' inside those planets in the form of fake fossils and layers of rock. Occasionally, a 'prank' would slip through like the boot-prints in the sediment-strata or a digitial watch embedded in a seam of coal.