信使号太空船在德加陨石坑表面观测到因熔融冷却收缩所产生的斑驳裂痕。
In MESSENGER's view, the crater floor is seen to be filled with an intricate series of cracks, formed as the molten surface resulting from the impact cooled and contracted.
一项新研究发现，月球内部在近十亿年变冷收缩了，因而形成了月球地表的裂痕。
New research indicates cracks in the moon's crust that have formed as the interior has cooled and shrunk over the last billion years or so.
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