Dating craters

Secondary craters are formed by fallback debris from large impacts (primary craters).A single large impact can produce a million secondary craters, blurring relationships between crater counts and the age of a surface.This knowledge can be used to prove whether models predicting crater impact and frequency are accurate.

Crater-count dating seems perfectly logical: the more craters, the older the landscape.They compared a series of before and after shots, and discovered 222 new craters had formed.This led to a new estimate, that says 180 craters of at least ten metres in diameter form each year, according to an accompanying News and Views article in This is partly down to the team recognising surface reflectance zones of the craters that were wider than recorded. This new 12 metre diameter impact crater formed between 25 October 2012 and 21 April 2013 and was discovered in a temporal ratio image created from two Narrow Angle Camera (NAC) images.Scene is 1200 metres wide, looks at data collected by Nasa’s Lunar Reconnaissance Orbiter (LRO), which has been gathering images of lunar impacts over the course of the last few years in greater detail than has ever been possible before.

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