Wednesday, August 8. 2012 Crater modification is a topic of
interest to lunar scientists because most of the impact craters
on Earth are heavily degraded. Meteor Crater is the best-
preserved and youngest impact crater studied on Earth, and
fieldwork spanning as far back as the 1800s has greatly improved
the understanding of crater formation and modification. By
comparing geologic features on the Moon to those that are well-
studied on Earth, scientists can begin to understand the
complexity of geologic processes that constantly change the
lunar surface. Granular debris flows are the result of material
moving downhill due to gravity. The flows often contain fine-
grained material, forming a smooth, fluid-like texture, and may
be mistaken for impact melt flows. Today's Featured Image
highlights the complex and diverse nature of debris flows that
represent erosive events that are likely occurring on the Moon
today. Located on the eastern wall of Alpetragius B crater (~10
km diameter) in Mare Nubium, this debris fl