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This is a cliff on comet 67P/Churyumov–Gerasimenko. It's about 1 km tall. If you jumped from the top, it would take you 47 minutes to reach the bottom, and you'd probably be OK.

This view is a mosaic comprising four images taken by the ESA Rosetta spacecraft's NAVCAM. At the time, the spacecraft was 20 km from the centre of the comet. The images were taken on 10 December 2014; the resolution is 1.71 m/pixel and the mosaic measures 2.9×2.6 km. Credit: ESA/NAVCAM/S. Atkinson

would still manage to sprain my ankle