The 1 km high cliff in the photo is located on the surface of the comet. The European Space Agency (ESA) launched the unmanned Rosetta spacecraft, which captured images of Comet Churyumov-Gerasimenko from 2014 to 2016, revealing its dark core. This rugged cliff was detected early in the Rosetta mission. Although the cliff reaches a height of about 1 km, it is estimated that a person would have a high chance of survival if they jumped off due to the comet's low surface gravity.
Below the cliff lies a relatively flat terrain, scattered with boulders that can reach up to 20 m in diameter. According to the data collected by Rosetta, the ice on this comet has a significantly different ratio of deuterium compared to Earth’s seawater. This suggests a high possibility that the origins of the water are different. The name of the spacecraft, 'Rosetta,' is derived from the Rosetta Stone, which enabled the deciphering of ancient Egyptian script.