Giant ‘tree stump’ impact crater spotted on Mars

This image from CaSSIS aboard the ExoMars TGO reveals an impact crater on Mars that looks like a tree stump. (Image credit: ESA/Roscosmos/CaSSIS, CC BY-SA 3.0 IGO)

A Mars probe has snapped a peculiar image of the Red Planet’s surface that looks like a giant tree stump, rings and all. 

The ExoMars Trace Gas Orbiter (TGO), a joint mission by the European Space Agency (ESA) and Russia’s space agency Roscosmos, studies Mars from above, circling the planet and collecting data about its sparse atmosphere. But this orbital vantage point also allows TGO to see Mars from above, snapping images with its Color and Stereo Surface Imaging System (CaSSIS) camera.