每日天文一图展示了由欧洲航天局罗塞塔号探测器拍摄的丘留莫夫-格拉西缅科彗星上的千米高悬崖。罗塞塔号在2014年至2016年间环绕该彗星飞行，发现了这个崎岖的悬崖。尽管悬崖高度惊人，但由于彗星表面重力较低，人类从悬崖上跳下可能仍然可以存活。悬崖底部是相对平坦的地形，散布着一些直径达20米的巨石。罗塞塔号的数据还表明，彗星上的冰与地球海洋中的水具有不同的氘含量，这暗示它们可能起源不同。探测器以罗塞塔石碑命名，象征着帮助人类解读古埃及文字的意义。

🚀 罗塞塔号探测器在丘留莫夫-格拉西缅科彗星上发现了高达一千米的悬崖，该悬崖表面崎岖不平，是彗星地貌的显著特征。

🧗 尽管悬崖很高，但由于彗星的低重力，人类从悬崖上跳下理论上是可能存活的，这颠覆了我们对传统悬崖的认知。

🧊 罗塞塔号的数据显示，彗星上的冰与地球海洋中的水具有不同的氘含量，这暗示彗星上的水可能起源于与地球不同的地方。

🗿 罗塞塔探测器以罗塞塔石碑命名，象征着其任务如同破译文字一样，帮助人类解读宇宙的奥秘。

Astronomy Picture of the Day Discover the cosmos!Each day a different image or photograph of our fascinating universe is featured, along with a brief explanation written by a professional astronomer.2024 December 16 A Kilometer High Cliff on Comet Churyumov - Gerasimenko Image Credit & Licence (CC BY-SA 3.0 IGO): ESA, Rosetta spacecraft, NAVCAM; Additional Processing: Stuart Atkinson Explanation: This kilometer high cliff occurs on the surface of a comet. It was discovered on the dark nucleus of Comet Churyumov - Gerasimenko (CG) by Rosetta, a robotic spacecraft launched by ESA, which orbited the comet from 2014 to 2016. The ragged cliff, as featured here, was imaged by Rosetta early in its mission.Although towering about one kilometer high, the low surface gravity of Comet CG would likely make a jump from the cliffs by a human survivable. At the foot of the cliffs is relatively smooth terrain dotted with boulders as large as 20 meters across.Data from Rosetta indicates that the ice in Comet CG has a significantly different deuterium fraction -- and hence likely a different origin -- than the water in Earth's oceans. The probe was named after the Rosetta Stone, a rock slab featuring the same text written in three different languages that helped humanity decipher ancient Egyptian writing. Tomorrow's picture: near to the heart <| Archive| Submissions | Index| Search| Calendar| RSS| Education| About APOD| Discuss| > Authors & editors: Robert Nemiroff(MTU) &Jerry Bonnell (UMCP)NASA Official: Amber StraughnSpecific rights apply.NASA Web Privacy,Accessibility, Notices; A service of:ASD atNASA /GSFC, NASA Science Activation& Michigan Tech. U.