Time to open the thirteenth door in the advent calendar. Until the New Year, I’ll be opening a door onto a different landscape from somewhere in the solar system. Where in the solar system are these parallel gouges?Door 13Credit: ESA 2010 MPS for OSIRIS Team MPS / UPD / LAM / IAA / RSSD / INTA / UPM / DASP / IDA A good guess for this image would have been Mars’ moon Phobos, which is well known for its system of grooves. But it’s actually ….
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