2025年7月15日
Collapse in Hebes Chasma on Mars
Image Credit & License: ESA/DLR/FU Berlin (G. Neukum)
Explanation: What’s happened in Hebes Chasma on Mars? Hebes Chasma is a depression just north of the enormous Valles Marineris canyon. Since the depression is unconnected to other surface features, it is unclear where the internal material went. Inside Hebes Chasma is Hebes Mensa, a 5 kilometer high mesa that appears to have undergone an unusual partial collapse — a collapse that might be providing clues. The featured image, taken by ESA’s robotic Mars Express spacecraft currently orbiting Mars, shows great details of the chasm and the unusual horseshoe shaped indentation in the central mesa. Material from the mesa appears to have flowed onto the floor of the chasm, while a possible dark layer appears to have pooled like ink on a downslope landing. One hypothesis holds that salty rock composes some lower layers in Hebes Chasma, with the salt dissolving in melted ice flows that drained through holes into an underground aquifer.
Tomorrow’s picture: unicorn space rose
火星赫伯斯峡谷的塌方
影像提供与授权: ESA/DLR/FU Berlin (G. Neukum)
说明: 火星的赫伯斯峡谷（Hebes Chasma）发生了什么事？赫伯斯峡谷是位于庞大水手峡谷北侧的一个凹地，此凹地和附近的其他结构皆无关联，因此，它内部的物质跑去那里目前仍不明。话说赫伯斯峡谷内、5公里高的赫伯斯平顶山，看似经历了不寻常的部分崩塌，而此一塌陷可能提供某些线索。上面这幅由火星快车号探测器所拍摄的主题影像，非常细致地呈现了峡谷和平顶山中心的马蹄形凹陷。平顶山的物质看似已流至谷底，而斜坡底则像是积垒着一滩墨色的物质。有假说指称，赫伯斯峡谷下方有数个盐岩层，后来盐溶解在融溶的冰水里，并穿过岩孔排放到地下的含水层里。
明日的图片: unicorn space rose
