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Targeting the Moon

机译：瞄准月亮

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Hawing completed a PhD in impact cratering at Imperial College London nearly two years ago, Dr Veronica Bray is now a Research Associate at the Lunar and Planetary Laboratory within the University of Arizona. There she studies impact craters on the Moon, Mars and icy satellites of Jupiter using new images from the Lunar and Mars Reconnaissance Orbiters (LRO and MRO) and archival data from the Galileo and Voyager missions. In the case of LRO, Veronica actually gets to select the targets herself, but with hundreds of thousands of craters to choose from, where do you start? A young 120-metre crater with bright ejecta rays on the floor of the much larger Murchison Crater, imaged by LROC. Image: NASA/ GSFC/Arizona State University."With the lunar work, I've been studying the impact melt morphology in fresh craters," she says. In this sense, `fresh' means craters that formed within the last 1.1 billion years - one of Veronica's targets has a youthful age of between one and ten million years. "During crater formation the expanding cavity is lined with melted rock. Dependent on its position within this cavity, sections of the melt layer are ejected from the crater, draped over the rim, or remain within the crater. The amount and location of each melt deposit yields a variety of different characteristics. The Lunar Reconnaissance Orbiter Camera (LROC) has been revealing striking surface features in these melt deposits that we cannot see in Earth or Mars analogues because they are too eroded or covered by dust."
机译：维罗妮卡·布雷（Veronica Bray）博士两年前在伦敦帝国理工学院（Imperial London）获得了撞击坑的博士学位，现在是亚利桑那大学月球和行星实验室的研究员。她在那里使用月球和火星侦察轨道飞行器（LRO和MRO）的新图像以及伽利略号和旅行者号飞行任务的档案数据研究木星对月球，火星和冰冷卫星的撞击坑。对于LRO，Veronica实际上可以自己选择目标，但是有成千上万的陨石坑可供选择，那么您从哪里开始呢？ LROC拍摄的一个更大的默奇森火山口地板上的年轻120米火山口，上面有明亮的喷射射线。图片：NASA / GSFC /亚利桑那州立大学。“通过登月工作，我一直在研究新鲜火山口的撞击融化形态，”她说。从这个意义上讲，“新鲜”是指在过去的11亿年内形成的陨石坑-维罗妮卡的目标之一是年轻年龄在一到一千万年之间。 “在火山口形成过程中，膨胀腔内衬有熔化的岩石。根据其在该腔内的位置，部分熔融层会从火山口中弹出，披覆在边缘上，或留在火山口中。每种熔体的数量和位置沉积物具有多种不同的特征。月球侦察轨道照相机（LROC）揭示了这些熔融沉积物中的明显表面特征，我们无法在地球或火星类似物中看到它们，因为它们太容易被侵蚀或被灰尘覆盖。”

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