This Mercury crater has some very bright features on the crater floor.
There's a high resolution shot of it here:
This image, taken with the Narrow Angle Camera (NAC), gives us a stunning close-up view of the floor of Eminescu crater.
The bright features are called "hollows", and might (emphasis on the might) be due to loss of volatiles from the surface after the impact.
Or not. That's why more research is needed.
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